Re: [pinhole-discussion] Question about Pinhole Factory
In a message dated 11/01/2002 10:18:23 AM Central Standard Time, harv...@aracnet.com writes: A while back I contacted the Pinhole Factory to ask the same question. ZeroImage cameras? Copies? And why the significantly higher prices? They answered my e-mail only to refuse to tell me anymore about the cameras. My sense was that they did not want to admit that they copied the designs of the ZeroImage cameras. And they are copies, not ZeroImage cameras being sold by an English company. From www.zeroimage.com, -- Imitations or copies of this item can found in England. Please be advised that we do not have any authorized dealer or manufacturer of our products in England!!! At the prices they are charging for the Silver *** cameras, they could buy them at retail price from ZeroImage and still be making a substantial profit. Tom Some time back, Zernike Au who owns Zero Image and may be still on this emailing list , had posted a notice to the effect he was looking for an attorney to looking into copyright infringements(?) by the above mentioned company. Zernike was asking around as to what can be done . I have one of Zernikes Zero Image Multi Format cameras, and would not part with it for anything . Ask around, because I think others on this list have some of his cameras, and most if not all will echo my sentiments on ownership . Zernike is a very ethical man , and I have contacted him via email several times, regarding things I would like to do with my pinhole camera from Zero Image, and yet not mar or damage the fine wood . He has been most gracious and replied within a day or two at best .He has my vote, and my business .I need not look elsewhere .Seems to me, if the above mentioned company is not willing to give out info , they might have something to hide .Ask Zernike just about anything , and he will be forthcoming in assistance, can the same be said for the company in England ? Apparently not .
RE: [pinhole-discussion] re pinhole size
What about using a beer can? Is that to thick of a material? Thanks. Travis -Original Message- From: Paul Prober [mailto:pro...@silcom.com] Sent: Friday, November 01, 2002 12:05 PM To: pinhole-discussion@p at ??? Subject: [pinhole-discussion] re pinhole size Hi, The pinhole size is not the problem. The thickness of the material is. At 70mm or less 0.001 inch thickness and thinner is required to allow for side angle view with minimum roll off. A pinhole with the minimal thickness the expected at 120 degree [+/-60] view angle 1 stop roll off at edge. Lenox Laser has laser pinholes for photography in 0.0005 stainless steel. When designing the PinPLUS Pinhole cameras this became an important requirement for the wide angle cameras design. Lenox Laser drilled pinhole of 250 microns [0.010 inches] in 0.0005 stainless steel meet the requirements for 100 degree diagonally view angle of the PinPLUS 64mm. Paul Prober ___ 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/
[pinhole-discussion] re pinhole size
Hi, The pinhole size is not the problem. The thickness of the material is. At 70mm or less 0.001 inch thickness and thinner is required to allow for side angle view with minimum roll off. A pinhole with the minimal thickness the expected at 120 degree [+/-60] view angle 1 stop roll off at edge. Lenox Laser has laser pinholes for photography in 0.0005 stainless steel. When designing the PinPLUS Pinhole cameras this became an important requirement for the wide angle cameras design. Lenox Laser drilled pinhole of 250 microns [0.010 inches] in 0.0005 stainless steel meet the requirements for 100 degree diagonally view angle of the PinPLUS 64mm. Paul Prober
Re: [pinhole-discussion] large format ortho
Hi: I use 8x10 ortho to make big negatives. I mostly print cyanotype though. The key is using a very low contrast developer. People have had success using a highly diluted print developer - such as dektol, selectol sprint etc. diluted (10:1 to 30:1). The ASA of the film is around 6 with these developers. I find these are still too contrasty with the ortho film I use (kpgraphics CGP) A very good low contrast developer formulated specifically for producing low contrast negatives from ortho film is Dave Soemarko's LC-1 developer http://members.aol.com/fotodave/Articles/LC-1.html This developer is not commerically made - you must mix it yourself. By varying the dilution and mix its possible to control the contrast effectively. LC-1 does result in a significant speed loss though - film processed in LC-1 has an ASA of 1. This does become an issue with very large format cameras, if your pinhole is small, the f stop is so small that the expsosure time can stretch to hours. You might try seeing how large of a pinhole you can tolerate (and its fuzziness) before you start shooting 16 x 20 I think an XTOL ascorbic acid based developer at a low pH seems to work better See Mytol http://www.jackspcs.com/mytol.htm ChemicalAmount Units Distilled Water 750 ml Sodium Sulfite 60 g Sodium Metaborate 4 g Sodium Ascorbate13 g Phenidone 0.15g Sodium Metabisulfite3 g Distilled water to make 1000ml This formula mixed without the alkali agent (Sodium Metaborate) may work better. I also find that pre-flashing the film at an exposure just less than something that would fog the film extends the range and sensitivity of the film. Testing with a Stouffer step tablet I'm able to get an 18 step negative. Using a similar developer to Mytol and preflashing the film. Gord On Fri, 1 Nov 2002, Tim Midkiff wrote: Hello all, Does anyone have firsthand experience using large format ortho film, 16x20, in camera for gum prints? I've been doing a few the hard way, making the first exposure, then making a high density neg then making the gum prints. any ideas or suggestions, etc would be greatly welcomed!!! thanks, tim ___ 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/ - Gordon J. Holtslander Dept. of Biology hol...@duke.usask.ca112 Science Place http://duke.usask.ca/~holtsgUniversity of Saskatchewan Tel (306) 966-4433 Saskatoon, Saskatchewan Fax (306) 966-4461 Canada S7N 5E2 -
Re: [pinhole-discussion] Question about Pinhole Factory
At 10:39 AM 11/1/2002 -0500, you wrote: Is anyone familiar with the Pinhole Factory is England? See http://www.pinholesolutions.co.uk/pinhole_factory.html The Silver Gem and Silver Jewel pinhole cameras look like copies of the Zero 2000 and Zero 2000 multi-format camera. Are they in fact one in the same? Thanks, R.J. A while back I contacted the Pinhole Factory to ask the same question. ZeroImage cameras? Copies? And why the significantly higher prices? They answered my e-mail only to refuse to tell me anymore about the cameras. My sense was that they did not want to admit that they copied the designs of the ZeroImage cameras. And they are copies, not ZeroImage cameras being sold by an English company. From www.zeroimage.com, -- Imitations or copies of this item can found in England. Please be advised that we do not have any authorized dealer or manufacturer of our products in England!!! At the prices they are charging for the Silver *** cameras, they could buy them at retail price from ZeroImage and still be making a substantial profit. Tom
RE: [pinhole-discussion] Question about Pinhole Factory
-Original Message- From: pinhole-discussion-admin@p at ??? [mailto:pinhole-discussion-admin@p at ???]On Behalf Of Fox, Robert Sent: Friday, November 01, 2002 7:39 AM To: 'pinhole-discussion@p at ???' Subject: [pinhole-discussion] Question about Pinhole Factory Is anyone familiar with the Pinhole Factory is England? See http://www.pinholesolutions.co.uk/pinhole_factory.html The Silver Gem and Silver Jewel pinhole cameras look like copies of the Zero 2000 and Zero 2000 multi-format camera. Are they in fact one in the same? Thanks, R.J. ___ 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] Question about Pinhole Factory
They are NOT the same. The original, genuine articles are the Zero Image cameras at www.zeroimage.com. Tom - Original Message - From: Fox, Robert r...@aarp.org To: pinhole-discussion@p at ??? Sent: Friday, November 01, 2002 9:39 AM Subject: [pinhole-discussion] Question about Pinhole Factory Is anyone familiar with the Pinhole Factory is England? See http://www.pinholesolutions.co.uk/pinhole_factory.html The Silver Gem and Silver Jewel pinhole cameras look like copies of the Zero 2000 and Zero 2000 multi-format camera. Are they in fact one in the same? Thanks, R.J. ___ 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/
[pinhole-discussion] Question about Pinhole Factory
Is anyone familiar with the Pinhole Factory is England? See http://www.pinholesolutions.co.uk/pinhole_factory.html The Silver Gem and Silver Jewel pinhole cameras look like copies of the Zero 2000 and Zero 2000 multi-format camera. Are they in fact one in the same? Thanks, R.J.
[pinhole-discussion] large format ortho
Hello all, Does anyone have firsthand experience using large format ortho film, 16x20, in camera for gum prints? I've been doing a few the hard way, making the first exposure, then making a high density neg then making the gum prints. any ideas or suggestions, etc would be greatly welcomed!!! thanks, tim
Re: [pinhole-discussion] pinhole size
Michael, Pinholes are afocal, meaning: they don't have focal length, per se. You can use them to whatever distance pinhole-film you wish, knowing that if you don't use them to their optimum distance, results will be less-sharp, which depending on the photographer intentions could be good or bad for your resulting image. Knowing that a pinhole can be used at any distance, again, they are afocal, the fall-off is not caused by its size, but by 3 different factors: first: light on the film plane decreases as the distance pinhole-film increases, distance at the center is shorter than distance at the edges of the film, therefore you'll have fall-off as you go off film center. secondly: seen from the center of the film the pinhole looks round (assuming you made it round), but seen from the edges, it would look oval, that translate into less area for light to go thru, that too causes fall-off. Lastly: light falling at the edges, falls at an angle on the film, therefore covers a bigger area of the film, that too, causes fall off. Geekly speaking :) the fall off at the edges will be a factor of the function COSINE to the 4th power of half the total angle of view of your camera, in your case that translate to just over 3 stops. BTW, glass lenses are not exempt of this COSINE^4 condition, that is why for wide angle lenses manufacturers also make special filters to go with them and that correct the fall off at the edges by causing fall off at the center (forgot their name, center filters I think). If you were to use a pinhole optimum for 73mm, your fall off will be the same, the fall off is only a function of the angle of view, in other words, the wider the angle of your camera, the more fall off. Your camera has 109 degrees angle of view, the format diagonal is just 2.8 times the distance pinhole-film, BTW. Optimum does not mean longest, it means if you want the sharpest images possible use this distance, longer or shorter that optimum and the resolution suffers. The only way to get less fall-off is to make the film or paper to conform to a cylindrical shaped film plane and position the pinhole at the center of the circle describing the half cylinder, there are some examples here: http://www.cyberbeach.net/~dbardell/pinhole.html The reason why such cameras have less fall off is that the distance pinhole-film is the same from center to edge of film and also the light always falls perpendicular to the film so it doesn't have to cover more area (as explained above). Something else that contributes to a fall-off is the thickness of the material the pinhole is made of and whether it has burrs around its edges. Guillermo - Original Message - From: Michael Healy mjhe...@kcnet.com I bought the 12-lens set from Pinhole Resourses, and I've been using the .0102/.259mm pinhole on my 4x5. This one's claimed optimal focal length is supposed to be 48mm. I am using it with a recessed lensboard to a length of about 50mm. That's the closest I can get even w/ a bag bellows. The results are fantastic. I love the focal length. Unfortunately, its fall-off is quite noticable. No vignetting, but the fall-off is about 1.5-2 stops from center to edge. So I think I have to try the next one of the bunch, the one whose optimal focal length is reported to be 73mm. That seems like quite a jump, though. Before I try this at a shorter bellows length than 73mm, has anybody done this? Will I have problems just shooting this at, say, my 50mm (w/ bellows compensation)? Does their optimal mean longest? That's what the 48mm seems to mean, that if you go even to 50mm, you'll have fall-off. Anybody w/ experience of this? If this works, should I consider ordering a 50-55mm pinhole to fit my 4x5? I really like the weird, extreme result from the short one -- it's just that the light fall-off makes cyanotypes very difficult to print. I'm anticipating that albumen won't work much better. Thoughts? Mike Healy
Re: [pinhole-discussion] holga source in Chicago?
- Original Message - From: D. Hill zopp...@yahoo.com Calumet stocks them, do they have a storefront? Yes they do, as per their web site: Manager: Greg Hamlin Address: N Cherry St. Chicago, IL 60622 Phone: 312-440-4920 Fax: 312-664-1736 Hours: Monday-Friday 8:30 a.m.-5:30 p.m. Guillermo
[pinhole-discussion] pinhole size
I bought the 12-lens set from Pinhole Resourses, and I've been using the .0102/.259mm pinhole on my 4x5. This one's claimed optimal focal length is supposed to be 48mm. I am using it with a recessed lensboard to a length of about 50mm. That's the closest I can get even w/ a bag bellows. The results are fantastic. I love the focal length. Unfortunately, its fall-off is quite noticable. No vignetting, but the fall-off is about 1.5-2 stops from center to edge. So I think I have to try the next one of the bunch, the one whose optimal focal length is reported to be 73mm. That seems like quite a jump, though. Before I try this at a shorter bellows length than 73mm, has anybody done this? Will I have problems just shooting this at, say, my 50mm (w/ bellows compensation)? Does their optimal mean longest? That's what the 48mm seems to mean, that if you go even to 50mm, you'll have fall-off. Anybody w/ experience of this? If this works, should I consider ordering a 50-55mm pinhole to fit my 4x5? I really like the weird, extreme result from the short one -- it's just that the light fall-off makes cyanotypes very difficult to print. I'm anticipating that albumen won't work much better. Thoughts? Mike Healy
RE: [pinhole-discussion] authentic space
Hey Steve, Your decision to go with your intuition and shoot what you feel represents the theme of 'authentic space' rather than stick to some rigid predefined definition, I think was the right decision. As you mature as an artist...as you become a more seasoned artist you'll learn that you have to trust your gut. Even if it means breaking a rule or two or veering off onto a different direction. You'll find that some very happy accidents will occur and that your work will become a much more personal representation of yourself. Art is about expressing oneself not pleasing an audience (although I wonder going through some galleries). I too find the topic of authentic space quite interesting, especially in a North American context. There are so many non-authentic places that it is a real challenge to define the authentic space. A whole series could be done hunting down authentic spaces in Las Vegas. If you're interested in an analysis of North Americans' obsession with trying to create authentic spaces, I highly recommend an essay called Travels in Hyperreality by Umberto Eco. It's in a book of essays by Eco called Travels in Hyperreality. ...But then again I guess this would be more theory. Good luck with the project, and I hope you'll share your results with us. Back to lurking... -Will _ Unlimited Internet access for only $21.95/month. Try MSN! http://resourcecenter.msn.com/access/plans/2monthsfree.asp
