[pinhole-discussion] Circle template
I'd agree with Roseanne's suggestion #3 about making a template out of some stiff material. You could get any stiff sheet of plastic (something like a mat cutting board?) or even a thin wood that you could cut with jigsaw with a fine toothed blade. That way, you could place your film under the die in the darkroom and cut away with an Xacto knife or mat knife. How does that sound? This way you can make the die practically any shape you want by using a compass, trigonometry, whatever you like. Cary
Re: Re: [pinhole-discussion] The panopin
pinhole-discussion@p at ??? schrieb am 22.04.03 01:58:40: ...I need to check with Kurt ... James, a little bit out of topic : I tried to mail Kurt, because I will buy a pinoramic camera. But his E-Mail adress is wrong. can you help? Ingo __ UNICEF bittet um Spenden fur die Kinder im Irak! Hier online an UNICEF spenden: https://spenden.web.de/unicef/special/?mc=021101
RE: [pinhole-discussion] Image not filling out paper
Hi Shelly, Here is another way to look at it. This is a chart, in inches, that I created in Excel to help me decide which size of tube or cyninder cameras, like an oatmeal box, to use in various circumstances. Diameter is how wide the box is across. This is the focal length. Circumference is how big the circle around the outside of the box is, which tells you how big a piece of paper will fit inside (if you were to wrap it 360 degrees). 1/2 circumference is 180 degrees, or half of the circle. 1/2 circle is will give a full image without too much light falloff. It is also where light banding can start, but that is a completely different topic. The more the negative goes beyond the 1/2 circumference measure, the more likely you will get extreme or complete fall-off, especially in the corners of the image, since they are farthest from the center of the light cone that Ed mentioned. How big was the oatmeal box? My guess is somewhere between 3.5 and 5.5 inches. A 10-inch-wide piece of paper would fit in any of these tubes; but the smaller the focal length, the greater the likehood of vignetting. Diameter Circumference 1/2 Circ 2.00_ 6.28_ 3.14 2.50_ 7.85_ 3.93 3.00_ 9.42_ 4.71 3.50_11.00_ 5.50 4.00_12.57_ 6.28 4.50_14.14_ 7.07 5.00_15.71_ 7.85 5.50_17.28_ 8.64 6.00_18.85_ 9.42 6.50_20.42_10.21 7.00_21.99_11.00 7.50_23.56_11.78 8.00_25.13_12.57 Tom Miller -Original Message- From: pinhole-discussion-admin@p at ??? [mailto:pinhole-discussion-admin@p at ???]On Behalf Of Ed Kirkpatrick Sent: Tuesday, April 22, 2003 9:06 AM To: pinhole-discussion@p at ??? Subject: RE: [pinhole-discussion] Image not filling out paper Shelley, The dark areas are caused because that part of your paper lies outside the image cone as it projects through the pinhole into your camera. The diameter of the image circle expands outward from the pinhole at about 3.5 diameter per inch of focal length so if you can imagine the cone formed in your camera you will see why this effect occurs. Ed Kirkpatrick Ed Kirkpatrick Photography www.edkirkpatrick.com -Original Message- From: pinhole-discussion-admin@p at ??? [mailto:pinhole-discussion-admin@p at ???] On Behalf Of Rauch, Shelley Sent: Monday, April 21, 2003 1:29 PM To: pinhole-discussion@p at ??? Subject: [pinhole-discussion] Image not filling out paper Okay... another newbie question. One of the cameras that I am using is an oversized oatmeal can. I'm using 8X10 paper, which fits perfectly when placed horizontally. The image isn't taking up the entire area, and I'm wondering what exactly causes this, and what I can do to get it closer to the edges. Here is an example of what I'm talking about: http://www.pbase.com/image/15725356 Shelley C. Rauch Acquisitions Dept. (757)890-5116 Tabb-York County Public Library 100 Long Green Blvd. Yorktown, VA 23693-4138 ___ 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/
RE: [pinhole-discussion] The panopin
CJ, I know it's not always the most popular place to locate items, but I did see a panopin on e*ay... It is a kit camera made by Mike Bell, and it looks like you could take a look at the part(s) you were interested in making: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=2923945842category=15247 As for Guillermo's suggestion of the Bender darkslide- that would be very easy to make (they say so on the site)... I have a couple of old Graphlex 4x5's as well lots of holders extra darkslides. I could make the 2x5 slide put a pinhole camera together ready to shoot! Contact me offlist for info on this camera. John Moore Ramona, CA www.speakeasy.net/~jlmoore --- On Sun 04/20, CJ Rumpolo rump...@yahoo.com wrote: From: CJ Rumpolo [mailto: rump...@yahoo.com] To: pinhole-discussion@p at ??? List-Post: pinhole-discussion@pinhole.com Date: Sun, 20 Apr 2003 14:24:51 -0400 Subject: [pinhole-discussion] The panopin Hi, and a happy holiday to all. I was wondering, since I am pretty much a newbie at pinholing, and I am enjoying each moment so far, has anyone had experience with the panopin camera? I am thinking about getting one though I am still designing one of my own (the fun part for myself), I just do not have an idea on how to get the film advance mechanism to work. Also just how do paper negatives compare to film negatives? If the paper negatives are just as good then I can forego the film advance mechanism. Currently I am using a 4x5 camera I made up and using Polaroid 55 type film. I am hoping to scan in the negatives and then use my computer to keep an album of my work. I do not have a darkroom available. Any feedback would be most welcome. Enjoy. Oh and in keeping with the Easter holiday I was wondering, has anyone thought about blowing out eggs and then coating the inside with light sensitive emulsion exposing the eggs and then developing and carefully cutting the eggs open? I see it in my head but its just one of those random thoughts I get every now and again. 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/ ___ No banners. No pop-ups. No kidding. Introducing My Way - http://www.myway.com
Re: [pinhole-discussion] The panopin
- Original Message - From: CJ Rumpolo rump...@yahoo.com No I fully understand it would be unfair (if not illegal) to use someone elses ideas without consent. I really have no plans on stealing another person's hard work and design. I tend to look at things I like, then try to make them myself. Call it a test of my thinking skills. My current design is from another person's website but have run into a snag of film transport. Today I pretty much considered on giving up the whole project and just stay with the camera I have. CJ, Don't feel bad, do not give up in your project, firstly: you are trying to make a camera for yourself, not to massively produce it, secondly: there aren't too many manual ways you can turn the film cartridges inside a camera, 120 roll like cameras have been manufactured since the end of 19th century (I think) and those patents are now expired. If you take a look to early 20th century rolls film cameras winding mechanism you will find similarities with current 120 cameras mechanisms. I figure if I am using a 4x5 camera and I make a mask to give me two images of 2 x 5 on one sheet of film then I can enlarge the negative to pretty much panoramic scale. That's a good way to make panoramics, you just need a dark slide cut like this: http://www.benderphoto.com/2x5pa.htm The only thing I was thinking about was the curved film plane. I am guessing lenses use their curvature to correct for this and pinholes need the curved film plane to make the image appear as seen. Regular photo lenses don't use their curvature to correct what you think. Curved film plane pinhole cameras help you lower the light fall off. I tried to email Kurt from his site, hoping to purchase a camera, Other plans I had were to purchase an old view camera and convert it to a really expensive pinhole camera. If I remember correctly, Kurt's camera was priced at around $1000 and worth every penny, do the math, you could buy several old view cameras with the price of one of Kurt's camera. So don't think that buying a old view camera and using it as pinhole camera is a bad or expensive idea. Then again I should use Mr. Au's camera more often as well. Its really a nicely made device, though I think its focal length is a bit too wide to my style of photography. Then an old view camera may be good for you, perhaps a press camera or if I you have the money, get a 4x5 Shen-Hao http://www.shen-hao.com it sells for $625 at http://www.badgergraphic.com/search_product2.asp?x=2594 (a steal at that price) and if later you want to do glass lens 4x5 you just get the lens. Guillermo
