[pinhole-discussion] More on that earliest photograph
Coincidentally with the discussion going on here, the University of Texas issued this press release last week http://www.utexas.edu/opa/news/03newsreleases/nr_200311/ nr_hrc031121.html Nick On Dec 3, 2003, at 10:26 AM, I Zarkov wrote: Here's a link to the Niepce Museum http://www.niepce.com/ The oldest extant photographic image is in the Gernsheim Collection at the U. Texas at Austin if I rememeber correctly. But other investigators like Wedgewood had produced photographic images at around the same time but could not fix them. Peter -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] scanning negs question
Traci. Assuming you're using a 4 x 5 negative, 100 dpi at 300 percent would yield 1200 x 1500 pixels (a little bigger than your monitor) 300 dpi at 420 percent would yield 5040 x 6300 pixels (a lot bigger than your monitor.) In order to fit that large an image on the screen, the program would have to downsample it from it's real resolution to the screen resolution. Some programs, notably anything by Microsoft, do a terrible job at this. If your negatives are smaller, It may be that with the lower resolution images you're seeing them at their actual resolution, one pixel on the screen for one pixel in the image, which is always going to be the most accurate way to look at a digital image. You would probably see some improvement in the printed image with the higher resolution image, although once you pass about two times the printers halftone frequency (about 100 lines per inch for a laser printer), You won't see any more improvement. I'm not sure if it will help, but I've got a digital imaging primer about this at http://idea.uwosh.edu/nick/digitalimaging.htm Nick On Nov 10, 2003, at 6:22 PM, Traci Bunkers wrote: I am scanning some negatives right now and have noticed something that I haven't noticed before. . . When I do a quick scan at 100 dpi at 300%, it is sharper than scanning the same negative at 300dpi at 420%. Does anyone know why? I think it looks better (on my computer screen anyway) at the lower resolution. I haven't tried printing anything to see if there is a visible difference. -- Traci Bunkers Bonkers Handmade Originals http://www.bonkersfiber.com ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] The Pinhole of Nature
This summer, WPPD coordinator Tom Miller asked me to give a presentation at the Minnesota Center for Photography's Annual Pinhole Photography Forum, which took place this Sunday. Not knowing exactly what to talk about, I decided to write a book about pinhole photography and talk about that. "The Pinhole of Nature" is inspired by and modeled after William Henry Fox Talbot's great work, "The Pencil of Nature." It consists of 24 of my photographs and short essays about them (and pinhole photography in general). It's my take on the famous questions "Why pinhole?," "What pinhole?," and "What-me-pinhole?" It's available for download as a 1.8MB PDF file from http://idea.uwosh.edu/nick/pinholephoto.htm If for some reason you'd want to buy a printed copy, it's available for $9.74 at http://www.cafeshops.com/dvoracek This is the same company that the WPPD T-shirts were available from. I haven't seen the quality of the printing yet, and I'm not thrilled about the wire binding, but the T-shirts were good, so I'm hopeful it will be alright. Nick -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] A teacher with a question
Chris, I don't think you can recover silver from developer. Silver is reduced from the silver salts, but it should all stay in the emulsion to make the picture. It's used fixer that creates soluble silver compounds by reacting with the insoluble light sensitive silver salts.. I put the chemical equations for fixation at http://idea.uwosh.edu/nick/fixation.jpg , scanned from The Theory of the Photographic Process, 3rd ed., edited by C.E. Kenneth Mees. Silver recovery is both for pollution reduction (silver is a heavy metal) and economic, to recover silver, which you can make expensive tableware and other things from. I think it's pretty much the same as electroplating, which is pretty easy to set up with a copper penny and a battery if I remember from a demo by my 8th grade science teacher. Nick On Monday, August 11, 2003, at 08:45 AM, CJ Rumpolo wrote: Also what exactly is silver recovery? I am guessing its a way to remove silver from used developer, and is this done to save money or to help reduce water pollution? Just wondering. Planning on ordering some supplies this morning. Thanks again. Chris. ----- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] Re: Pinhole-Discussion digest, Vol 1 #905 - 14 msgs
[pinhole-discussion] What is the best scanner? DAlfrey,When I put my negs on the scanner bed without using the guides, I get thosecircles from the negs touching the glass. Does that happen to you? I'm notfamiliar with 55 negs, so maybe it doesn't happen with those.-- Traci BunkersBonkers Handmade Originalshttp://www.bonkersfiber.com> From: dalf...@aol.com> Reply-To: pinhole-discussion@p at ???> Date: Wed, 23 Jul 2003 04:42:19 EDT> To: pinhole-discussion@p at ???> Subject: Re: [pinhole-discussion] What is the best scanner?> > and the Type 55 neg is a tad larger than the "guide ' and I want> to include the perforations of the negs , I simply scan them without the> "carrier guides ".___Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing listPinhole-Discussion@p at ???unsubscribe or change your account athttp://www.???/discussion/ ___ No banners. No pop-ups. No kidding. Introducing My Way - http://www.myway.com --__--__-- ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? http://www.???/discussion/ End of Pinhole-Discussion Digest ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] coverage
Or longer focal lengths. With my 5 inch long 4 x 5 cameras (not particularly long) I see virtually no fall off. Nick Anyone wanting virtually no fall off, should consider half cylindrical cameras. Guillermo -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] Panorama characteristics?
I just found out that I could search the Oxford English Dictionary Website, because our University is a subscriber and it just recognizes my IP address. Sorry about the bad link Here's the definition from the OED that web reference led to. Panoramic Of, pertaining to, or of the nature of a panorama. panoramic camera, a photographic camera devised to rotate automatically so as to take a complete or extended landscape. 1813 REES Cycl. s.v. Panorama, The cylindrical surface on which objects are to be painted is called the panoramic surface. 1815 J. CAMPBELL Trav. S. Africa 361 (Jod.), I..expressed a wish, that my friends in London could be gratified with a panoramick view of it. 1838 ROBINS (title) Panoramic Representation of the Queen's Coronation Procession from the Palace to the Abbey. 1856 SIR B. BRODIE Psychol. Inq. I. ii. 35 An extensive panoramic view of the whole of the surrounding country. 1878 ABNEY Photogr. (1881) 214 In a panoramic camera the eye is supposed to travel round the view, the point of sight altering at each movement of the eye. b. Commanding a view of the whole landscape. 1880 D. W. FRESHFIELD in Academy 11 Dec. 418 The panoramic peak of Monte Incudine On Monday, May 12, 2003, at 09:02 AM, Nick Dvoracek wrote: The original definition of a panoramic camera was one that rotated to take in the entire surrounding scene, probably with synchronized moving film. (see http://dictionary.oed.com/cgi/entry/ 00170451?query_type=word&queryword=panorama&edition=2e&first=1&max_to_s how=10&single=1&sort_type=alpha) So I guess any flat or concave curved film plane would just be extremely wide angle no matter what it's shape, but I guess a convex curved film plane multiple pinhole camera like Chris Peregoy's, Pinhole Blender, or an assemblage like Quicktime VR would qualify. Gee, language is almost as much fun as pinhole photography. Nick On Friday, May 9, 2003, at 10:10 PM, James Kellar wrote: CJ, I believe that it's the ratio between the hight and the width of the film that makes it a panoramic, but I'm not sure where image becomes a panorama and not just a wide picture. I'm sure that some one will let us know. I do know that a 6x9 image not a panorama, but a 6x12 is. My guess is that the width has to at least double he hight of the image. James On Friday, May 9, 2003, at 09:20 PM, CJ Rumpolo wrote: Hi, sorry to have to ask but I was wondering what exactly qualifies a camera as being panoramic? Is it the angle of view, the length of the negative, or a combination of the two? I have been toying with making a curved backed panoramic camera but was wondering if I could just use a portion of a smaller negative or even mask off half of a 4x5 piece of film and make 2 2x5 negatives from a single sheet. Any advice would be most appreciated. CJ ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] Pinhole Camera for medical purposes
Jenn, Probably in the realm of idle speculation here. Field of view would be dependent on focal length just like visible light. Resolution is also a function of the size of the pinhole based on the standard circle of confusion arguments, The smaller the pinhole, the greater f is, therefore the sharper the image. On the lower limit, optimal pinhole size is a function of the wavelength and focal length. Since the wavelength of gamma rays is so short, it would be pretty hard to get a hole small enough for this to come in to play. The thick piece of lead is going to be your biggest problem. The ideal pinhole is in a planar surface. In actual practice, this means as thin a material as is opaque to the radiation involved. I 'm afraid I don't know the arguments, but when the hole becomes a tunnel, image quality fails, first because it restricts the field of view (strictly a geometry thing again) , and secondly because of internal reflections inside the tunnel (but I don't think gamma rays will reflect normally off a lead surface). There's gotta be some other reason also, the Victorian authors I've read make a big deal about the thinness of the material. Some of the first high energy astronomy detectors were clusters of tunnels like this that didn't form an image exactly, just restricted the field of view so much that they detected that there was a source of light somewhere in the direction the tunnel was pointing. Interesting idea though. On Tuesday, May 13, 2003, at 12:01 PM, jennem...@mad.scientist.com wrote: Hello, I'm working on a project that I thought might interest people here and I could certainly use input from people with more experience than I. I am working as a Medical Physicist for my summer Co-op position. One of the projects I am working on is an attempt to use a x-ray flouroscopy screen and a thick piece of lead with a hole drilled through the center to try and image the position of a point source of radiation in a radiation therapy procedure. The radiation used is gamma-radiation which is an electromagnetic wave like light so it has most of the same properties. I am trying to optimize the Field of View and the Resolution and can't find _any_ resources for pinhole imaging with the pinhole in a thick material. (The thickness is required, otherwise the strength of the radiation will over-expose the screen and all we will see is white.) Any knowledge, links or even idle speculation would be appreciated. Thanks, Jenn __ Quantum Mechanics: The dream stuff is made of -- __ Sign-up for your own FREE Personalized E-mail at Mail.com http://www.mail.com/?sr=signup ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] Panorama characteristics?
The original definition of a panoramic camera was one that rotated to take in the entire surrounding scene, probably with synchronized moving film. (see http://dictionary.oed.com/cgi/entry/ 00170451?query_type=word&queryword=panorama&edition=2e&first=1&max_to_sh ow=10&single=1&sort_type=alpha) So I guess any flat or concave curved film plane would just be extremely wide angle no matter what it's shape, but I guess a convex curved film plane multiple pinhole camera like Chris Peregoy's, Pinhole Blender, or an assemblage like Quicktime VR would qualify. Gee, language is almost as much fun as pinhole photography. Sorry if this gets double posted, I sent it this morning as rich text and the mailist server held it because of an unusual header. Nick On Friday, May 9, 2003, at 10:10 PM, James Kellar wrote: CJ, I believe that it's the ratio between the hight and the width of the film that makes it a panoramic, but I'm not sure where image becomes a panorama and not just a wide picture. I'm sure that some one will let us know. I do know that a 6x9 image not a panorama, but a 6x12 is. My guess is that the width has to at least double he hight of the image. James On Friday, May 9, 2003, at 09:20 PM, CJ Rumpolo wrote: Hi, sorry to have to ask but I was wondering what exactly qualifies a camera as being panoramic? Is it the angle of view, the length of the negative, or a combination of the two? I have been toying with making a curved backed panoramic camera but was wondering if I could just use a portion of a smaller negative or even mask off half of a 4x5 piece of film and make 2 2x5 negatives from a single sheet. Any advice would be most appreciated. CJ ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] Panorama characteristics?
The original definition of a panoramic camera was one that rotated to take in the entire surrounding scene, probably with synchronized moving film. (see http://dictionary.oed.com/cgi/entry/ 00170451?query_type=word&queryword=panorama&edition=2e&first=1&max_to_sh ow=10&single=1&sort_type=alpha) So I guess any flat or concave curved film plane would just be extremely wide angle no matter what it's shape, but I guess a convex curved film plane multiple pinhole camera like Chris Peregoy's, Pinhole Blender, or an assemblage like Quicktime VR would qualify. Gee, language is almost as much fun as pinhole photography. Nick On Friday, May 9, 2003, at 10:10 PM, James Kellar wrote: CJ, I believe that it's the ratio between the hight and the width of the film that makes it a panoramic, but I'm not sure where image becomes a panorama and not just a wide picture. I'm sure that some one will let us know. I do know that a 6x9 image not a panorama, but a 6x12 is. My guess is that the width has to at least double he hight of the image. James On Friday, May 9, 2003, at 09:20 PM, CJ Rumpolo wrote: Hi, sorry to have to ask but I was wondering what exactly qualifies a camera as being panoramic? Is it the angle of view, the length of the negative, or a combination of the two? I have been toying with making a curved backed panoramic camera but was wondering if I could just use a portion of a smaller negative or even mask off half of a 4x5 piece of film and make 2 2x5 negatives from a single sheet. Any advice would be most appreciated. CJ ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Tripod attachment
Looks like my method is practically identical to John Moore's, but since I already put the page together, it's at http://idea.uwosh.edu/nick/tripod/tripodmount.htm Nick On Wednesday, May 7, 2003, at 10:56 AM, Nick Dvoracek wrote: Never used the polaroid kit, but I use my foamcore cameras on a tripod. I put a 1/4 x 20 T-nut through a scrap of wood and attach that to the tripod, and then attach the camera to that with several rubber bands. Taken pictures in some pretty strong winds this way. I'll try to put some pictures on my web page later today. Nick On Wednesday, May 7, 2003, at 10:45 AM, Matti Koskinen wrote: hi all, today I received my Polaroid pinhole kit and sort of managed to put it together. The tripod mount sucks, first of all in the package was so little bit of sponge tape that it never held the camera, I bought some more, but still the tripod mount is unusable. Here's so windy that the camera moves so much, that the pictures I finally got, are all too > bad. I'd like to know how others have got the tripod mount rigid? Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Tripod attachment
Never used the polaroid kit, but I use my foamcore cameras on a tripod. I put a 1/4 x 20 T-nut through a scrap of wood and attach that to the tripod, and then attach the camera to that with several rubber bands. Taken pictures in some pretty strong winds this way. I'll try to put some pictures on my web page later today. Nick On Wednesday, May 7, 2003, at 10:45 AM, Matti Koskinen wrote: hi all, today I received my Polaroid pinhole kit and sort of managed to put it together. The tripod mount sucks, first of all in the package was so little bit of sponge tape that it never held the camera, I bought some more, but still the tripod mount is unusable. Here's so windy that the camera moves so much, that the pictures I finally got, are all too > bad. I'd like to know how others have got the tripod mount rigid? -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
Re: [pinhole-discussion] pinhole light falloff vs. circle of coverage question
At 300mm, fall off would be way outside a 4x5 negative. I use 125mm cameras with no noticable fall off. Pretty long focal length at 300mm though and lng exposures. Nick On Thursday, April 10, 2003, at 07:32 PM, Uptown Gallery wrote: Hello: If one set up a 4x5 bellows camera for pinhole with an appropriate pinhole for double extension (say 300 mm), placed the bellows at 300 mm but used a 4 x 5 filmholder, would that place the worst of the edge falloff outside the 4x5 image? It seems to me that this would work, at least to reduce the effect somewhat. Murray ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] More articles on line
My interlibrary loan wizards have been busy and I've come up with more articles referred to by D'Arcy Powers in "Advanced pinhole photography" which I've put on-line at http://idea.uwosh.edu/nick/pinholephoto.htm The collection now includes Pinhole (Lensless) Photography by Reverend J.B.Thomson (1901). An issue of the The Photo-Miniature, a general photography magazine published from 1899 to 1936. "Straightforward and plainly told" explanation of pinhole photography, including how-to instructions and even a section on stereo photography. 50 pages, 5.5. x 8.5 inches (PDF - 2.6MB) Advanced Pinhole Photography by H. D'Arcy Power (1905) Another issue of The Photo-Miniature. He approaches pinhole photography not as "an optical problem or scientific hobby", but from a "practical standpoint" to "produce pictures with a serious purpose". 45 pages, 5.5. x 8 inches (PDF - 2.9MB) Stenopaic or Pin-hole Photography by Frederick Wm.Mills and Archibald C. Ponton (1895) In addition to the advancement of the Greek term stenope for pin-hole, according to D'Arcy Power it is "chiefly notable for its profusion of algebraic calculations." Reviews lots of other work on optimum pinhole size, angle of view and exposure. 28 pages, 5.5. x 8 inches (PDF - 1MB) Photographie sans objectif. (1889) This file was sent to me by Jean-Louis Thiry of Montauban, France. It is a column from an 1889 French magazine called “La Nature” which dealt with any kind of scientific matters. My French is "tres mal" almost to the point of non-existence, but I can recognize that they're talking about some familiar issues. I think it reviews the work of Captain R.Colson who is refered to by all three of the above authors. The example photograph is a stereo pair. 4 pages (PDF - 890K) This is a little off topic, but I've been playing with Quicktime VR and had fun doing a self portrait that can be seen at http://idea.uwosh.edu/nick/Nicks_office.mov (MOV - 664K). I fess up to using lenses. Nick -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Re: brass for pinholes
I'm looking at a 10 year old pinhole made from "Precision Brand" .002 brass shim stock and it looks like new, although it has had a piece of tape put on and pulled off quite a few times. Actually the other side looks new also, as well as the rest of the 6 x 100 inch roll I cut it off of. (That's a lot of pinholes) Nick On Tuesday, February 25, 2003, at 02:42 PM, Bill Erickson wrote: Any suggestions would be great. Also, I'm planning to use .001 brass shim stock for the pinhole. Any disadvantages with oxidation of the brass? I imagine stainless would be best, but the brass was easy to get and cheap. Hopefully I'll have one of the cameras by April for the Pinhole Day activities. -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Can't open D'Arcy Powers article
The link is to a PDF file that your browser should download. Make sure "source" or "portable document format" is chosen as the format instead of text. You really need Acrobat reader 4.0. I think Acrobat reader 3.0 will open it, but all the graphics (essentially everything) will display as black squares. I can't get the document to open. ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] D'Arcy Power article on-line
A while ago there was a thread about an article by H. D'Arcy Power: "Advanced Pinhole Photography" from The Photo Miniature from July 1905. I got a photocopy through interlibrary loan and created an Adobe Acrobat document which I've posted on my website http://idea.uwosh.edu/nick/pinholephoto.htm I looked into the copyright issue and anything published before 1923 is in the public domain (http://www.unc.edu/~unclng/public-d.htm) so I'm pretty sure I'm not infringing anyone's copyright. I'm afraid it's kind of big, 3.6 MB, but that's not bad for a 46 page article scanned at high resolution (text and line art at 300 dpi, images, grey scale at 150 dpi). I've turned my interlibrary loan wizard loose on the citations he gives to other works and maybe will get those posted also. -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin Oshkosh Fax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Positive preview of a negative
Many people have trouble visualizing a positive image from looking at a negative. In a workshop, this can lead to discarding a promising negative or struggling to print a bad one. Modern camcorders with a negative "special effect" can be used to give an instant, and enlarged preview of a negative. See http://idea.uwosh.edu/nick/tvpreview.htm for a more complete description This may not be the most original idea, but I've found it helpful. -- -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] wondering about photoshop sharpening
I'm sure we've all thought about this. First of all, I also sharpen just about every scan, no matter what the source of the original image. The scans just don't match the sharpness of the original print without it in my opinion. As for combining pinhole and digital, I guess I justify myself with Adams " the negative is the composition, the print is the performance" I can't get the same images (or the same experience doing it) with regular cameras, and having been out of daily experience with the darkroom for fifteen years, I'm a pretty lousy performer with traditional methods any more, particularly contact printing paper negatives, but with a digital scan of that negative, I can get full range, burned and dodged, dust and scratch free prints, more honestly expressing what I want and what the negative holds. I imagine this discussion probably came up when Muddy Waters started playing the blues on an electric guitar. Nick Message: 6 Date: Mon, 09 Dec 2002 16:53:08 -0800 From: Jean Hanson To: "pinhole-discussion-request@p at ???" Subject: [pinhole-discussion] wondering Reply-To: pinhole-discussion@p at ??? About the message two days ago; a member took a pinhole image, "sharpened" it in Adobe or a digital method, and printed it out. I wonder why we don't just take traditional lens photographs and smear them a little and print them out to look like pinhole work. -- ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Exchanging Mac and Windows Photoshop files
Any file type that Photoshop will save on a Mac can be opened in Photoshop on a PC. On the Mac Photoshop has a preference to include the appropriate Windows extension automatically. In Windows, even if the file doesn't have the appropriate extension, you can open any valid image file using the Open command and Photoshop will probably recognize it. You may have to change the "files of type" to "All files" for them to show up in the file dialogue box. There may be issues relating to different versions, but the same version number on a Mac is identical to that version on Windows. Macs can also read and write to Windows formatted storage media. . Date: Thu, 21 Nov 2002 08:16:13 -0500 From: bendur...@aol.com To: pinhole-discussion@p at ??? Subject: [pinhole-discussion] Dan Burkholders Book Reply-To: pinhole-discussion@p at ??? Also Does anyone know how to convert images scanned and/or manipulated in photoshop on a mac, so they can be view and manipulated in photoshop on a pc, does typing "psd" on the end of the file work? Cheers -- -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Silver prints from digital files?
Does anyone know if a vendor exists who outputs digital files to real silver prints. Fiber would be great but I could live with RC. My local camera store didn't know of any. I can't imagine there's a lot of market, but you never know what someone might specialize in. I know there's been a lot of discussion of inkjet and other computer output. We have a Xerox/Tektronix Phaser 7700 color laser printer that puts out really good black and white print quality and can do it on a wide variety of papers. Are people exhibiting these inkjet and laser print images? Do juried shows accept them? Nick -- ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Pinhole mounted in bodycap on EOS cameras
Rune, Every SLR I've ever had had a mark on the top of the camera, a circle with a line through it, usually on the right (as you're looking through it) of the viewfinder that marked the location of the film plane. I just looked on a Nikon D1 Digital camera and it's still there! Nick My questions are: How do I measure the distance from the filmplane til the pinhole? -- -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Sometimes I'm just stunned
I've often told beginners to not be too surprised if close up shots of plants don't work out, because even the slightest breeze will move flowers enough too blur them with a long pinhole exposure. Last night sitting on my back porch in the heat, wishing for a cool breeze, I realized that it actually was absolutely still. This Peace rose had been blooming it's little heart out and had some huge honkin' blossoms way out at the end of some pretty long stems. Common sense told me it would never work, but fortified by the shorter exposures available on a new wide angle (f125, 4 x 5, 2.5 inch F.L.) camera, I gave it a shot. That late in the evening it took a four minute exposure. The picture is uploaded to the discussion list gallery at http://www.???/discussion/upload/gallery2002.php?pic=dvoracek_rose.jpg I will fess up to giving it one pass at sharpening in Photoshop, but I do that with every picture I scan, pinhole or not. I still can't believe that flower held that still for that long. Nick -- ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Pinhole class gallery
I just completed a two week program for kids just completing 4th through 7th grade. A gallery of their work can be found at http://idea.uwosh.edu/nick/goal/pinhole02.html. -- -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html http://idea.uwosh.edu/nick/handouts.htm
[pinhole-discussion] Electrical tape for pinhole purposes
About 10 years ago I got the same idea about cheap electrical tape. Tried it out and it seemed to work great, so I ordered about 100 rolls for a project to provide pinhole cameras to schools. Most of it hardly stuck at all and the rest came loose pretty quick. Maybe it's OK for making metal pintoids light tight, but I wouldn't recommend it for assembling foamcore or matboard cameras. A physicist I know also told me it's not opaque in the infrared if you're into that! Guy wrote: ". How did you get them light tight? Did you wrap some > tape around to seal the light away? I suppose that you loaded them in a > light-tight bag. How many would you carry around with you on a typical > day?" . That got expensive. I've found electrical tape on sale ... three rolls for a buck. I made over one hundred Pintoids. Marcy Merrill Photographer www.merrillphoto.com ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324 http://idea.uwosh.edu/media_services/home.html
Re: [pinhole-discussion] wideangle, telephoto, etc
I did a little graphic a few years ago to help explain the relationship between film size, focal length, angle of view and magnification. You can see it at http://idea.uwosh.edu/nick/focallength.gif. Hope it helps Nick -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324
[pinhole-discussion] Safelight
I've been using a red "party" bulb from the grocery store for about 10 years. You have to check around the base to make sure the red coloring covers completely. I covered the gaps with opaque tape. I've also used orange christmas tree lights. I haven't tried leaving a piece of paper out for 24 hours, but I haven't been all that careful about handling paper under it. From: "Gordon J. Holtslander" The only one of these that _has_ to be bought from a photo store is the safelight. The rest can be got from a hardware store. Nick ------ Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324
[pinhole-discussion] Summer kids workshop pix
I've been teaching a summer workshop for 4th - 7th graders for the last two weeks. A look at their work is available at http://idea.uwosh.edu/nick/goal/pinhole.html Nick -- Nick Dvoracek dvora...@uwosh.edu Director of Media Services Voice: 920-424-7363 University of Wisconsin OshkoshFax: 920-424-7324
