Re: [pinhole-discussion] Question on image circle and medium format pinhole camera design
You should get full coverage of a 6x6 negative with the focal length you mentioned. I'd agree that the problem is most likely physical obstruction.- Original Message - From: Fox, Robert r...@aarp.org To: pinhole-discussion@p at ??? Sent: Tuesday, November 12, 2002 2:04 PM Subject: RE: [pinhole-discussion] Question on image circle and medium format pinhole camera design Thanks Phil! It's clearly the first scenario -- the corners are perfectly clean and black. I suppose I will need to modify the camera some more to get rid of that slight edge that sticks up. Much appreciated, R.J. -Original Message- From: Philip willarney [mailto:pwillar...@yahoo.com] Sent: Tuesday, November 12, 2002 3:00 PM To: pinhole-discussion@p at ??? Subject: Re: [pinhole-discussion] Question on image circle and medium format pinhole camera design --- Fox, Robert r...@aarp.org wrote: ..snip.. Question: my images are all circular, cutting off the corners cleanly of the square print. Is this because the image circle is too small for the film? I'm wondering if the circular edge of the front plate is being picked up on film, since the edge sticks up about 1/4 inch. If the edges of the photos are sharp, hard edges, it's probably vignetting -- something in the light path from the outside world to the film is blocking the light. So you're getting a nice clean photo of the edges of the lens holder, for instance. If the edge is a slow fade from picture to dim picture to black, then it's falloff. Pinholes as such don't have an image coverage circle -- the edges just get dimmer and dimmer as they get farther from the pinhole and get less less light. I think. Any quibbles, anyone? -- pwillar...@yahoo.com __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2 ___ 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] Question on image circle and medium format pinhole camera design
- Original Message - From: Philip willarney pwillar...@yahoo.com If the edge is a slow fade from picture to dim picture to black, then it's falloff. Pinholes as such don't have an image coverage circle -- That is correct, the image circle is determined by how many stops at the edges we are willing to tolerate. Those 3X or 3.5X the focal length coverage mentioned everwhere, have no meaning whatsoever, IMO. Guillermo
Re: [pinhole-discussion] Question on image circle and medium format pinhole camera design
- Original Message - From: Fox, Robert r...@aarp.org I'm thrilled with the results! The proofs are properly exposed (surprise given I was using a flap for the shutter and counting the seconds) on Ilford XP2 film (iso 400). I used f64 as the base exposure reading, then multiplied by 6.3, which worked great. Bear in mind that multiplying the f/64 by 6.3 or 6.48 (if you want to be more exact) will give you a reciprocity uncorrected value for the f/stop of your camera. If by any chance you noticed that the longer the exposures the thinner the negatives, that may indicate is time to correct for reciprocity at those levels of long exposures. I'd suggest you take some notes when shooting. Proof print may or may not show up the underexposure, some may even benefit from it!! Question: my images are all circular, cutting off the corners cleanly of the square print. Is this because the image circle is too small for the film? I'm wondering if the circular edge of the front plate is being picked up on film, since the edge sticks up about 1/4 inch. Any time the corners are cut cleanly as you mention, it is probably mechanical vignetting, the front plate is obviously in the way. You could check for mechanical vignetting by opening the rear and aiming the camera to a bright light while having your eye, the corner of the opening (6x6) and the pinhole line up, if you can't see light coming in thru the pinhole, then you have vignetting. Guillermo
RE: [pinhole-discussion] Question on image circle and medium form at pinhole camera design
Thanks Phil! It's clearly the first scenario -- the corners are perfectly clean and black. I suppose I will need to modify the camera some more to get rid of that slight edge that sticks up. Much appreciated, R.J. -Original Message- From: Philip willarney [mailto:pwillar...@yahoo.com] Sent: Tuesday, November 12, 2002 3:00 PM To: pinhole-discussion@p at ??? Subject: Re: [pinhole-discussion] Question on image circle and medium format pinhole camera design --- Fox, Robert r...@aarp.org wrote: ..snip.. Question: my images are all circular, cutting off the corners cleanly of the square print. Is this because the image circle is too small for the film? I'm wondering if the circular edge of the front plate is being picked up on film, since the edge sticks up about 1/4 inch. If the edges of the photos are sharp, hard edges, it's probably vignetting -- something in the light path from the outside world to the film is blocking the light. So you're getting a nice clean photo of the edges of the lens holder, for instance. If the edge is a slow fade from picture to dim picture to black, then it's falloff. Pinholes as such don't have an image coverage circle -- the edges just get dimmer and dimmer as they get farther from the pinhole and get less less light. I think. Any quibbles, anyone? -- pwillar...@yahoo.com __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2 ___ 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 on image circle and medium format pinhole camera design
--- Fox, Robert r...@aarp.org wrote: ..snip.. Question: my images are all circular, cutting off the corners cleanly of the square print. Is this because the image circle is too small for the film? I'm wondering if the circular edge of the front plate is being picked up on film, since the edge sticks up about 1/4 inch. If the edges of the photos are sharp, hard edges, it's probably vignetting -- something in the light path from the outside world to the film is blocking the light. So you're getting a nice clean photo of the edges of the lens holder, for instance. If the edge is a slow fade from picture to dim picture to black, then it's falloff. Pinholes as such don't have an image coverage circle -- the edges just get dimmer and dimmer as they get farther from the pinhole and get less less light. I think. Any quibbles, anyone? -- pwillar...@yahoo.com __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2
Re: [pinhole-discussion] Limited Edition Pinhole Polaroid Camera
--- Guy Glorieux guy.glori...@sympatico.ca wrote: - Original Message - From: George L Smyth glsm...@yahoo.com http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=1395685792 I'm not sure that overpriced even begins to describe it. g george What's most amazing about eBay is that someone will probably buy it at that price...! The trick for the seller is to describe the item as limited edition or rare or any word that suggests there may not be another occasion to get that particular item. Buyers then flock like sheeps and bid the price up to unbelievable levels... Guy Don't get me wrong, I love eBay, but this sort of thing just makes me shake my head. The most outrageous thing I ever saw there was a used Kleenex (it went for 25 cents). Sometimes people need to think why an item would be a limited edition. Cheers - george = Handmade Photographic Images - http://GLSmyth.com DRiP Investing - http://DRiPInvesting.org __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2
Re: [pinhole-discussion] Limited Edition Pinhole Polaroid Camera
I laughed when I saw the auction the first time- it is amazing what people will pay for some things on eBay. If you look around, though, you can find some neat items that make great pinhole cameras. I've picked up a couple of the Tektronix C-5C Oscilloscope cameras am in the process of converting them to pinhole. They have a few great features that work well for pinhole: the shutter is electronic with timed speeds from .1 to 5 seconds, as well as an open shutter feature for longer exposures; they use the 3-1/4 x 4-1/4 pack film, so you can use the 665PN to get a negative; they're very light; the lenses are easily removed with just a couple of screws; and they usually can be found for under $15! Since there isn't an adjustable aperature you need to put the pinhole behind the shutter. The distance from the pinhole to the film is 90mm, so I'm using a .4mm pinhole. According to Larry Fratkin's calculator this results in a f-stop of 225 with 172mm of coverage. I've rigged an old Kodak Series V filter holder for the front, so that I can add some warmth when using color film. Also helps with contrast on BW. The only downsides to the C-5C are the lack of tripod adapter, which I'm going to add, and the faceplate is open- so I'm going to manufacture a plate. If the camera comes complete with the cone that is normally attached to the front of the oscilloscope, then you can use that plastic to make a faceplate. I'll take some pics post them to my site: http://www.speakeasy.net/~jlmoore/ John Moore Ramona, CA - Original Message - From: George L Smyth glsm...@yahoo.com http://cgi.ebay.com/ws/eBayISAPI.dllViewItemitem=1395685792 I'm not sure that overpriced even begins to describe it. g george __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2
Re: [pinhole-discussion] Limited Edition Pinhole Polaroid Camera
To the person ho purchases that piece.I have numbered and signed by the artist, tested film canisters including photo of the Brooklyn bridgeMickey
Re: [pinhole-discussion] Limited Edition Pinhole Polaroid Camera
- Original Message - From: George L Smyth glsm...@yahoo.com http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=1395685792 I'm not sure that overpriced even begins to describe it. g george What's most amazing about eBay is that someone will probably buy it at that price...! The trick for the seller is to describe the item as limited edition or rare or any word that suggests there may not be another occasion to get that particular item. Buyers then flock like sheeps and bid the price up to unbelievable levels... Guy
Re: [pinhole-discussion] russian camera?
I don't know anything about them but if this is it maybe you can email the auctioneer and ask him some questions about it. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=800677370 - Original Message - From: Peter Wiklund peter.wikl...@journalistgruppen.se To: pinhole-discussion@p at ??? Sent: Tuesday, November 12, 2002 5:46 AM Subject: [pinhole-discussion] russian camera? Hi, anyone who knows what this is? http://www.lpfoto.se/swe/auktioner/gamla_auktioner/auktionx17/img/big/0441.g if or this: http://www.lpfoto.se/swe/auktioner/gamla_auktioner/auktionx17/img/big/0442.g if The cameras are to be sold at an auction in Stockholm, Sweden Dec 8th. The texts for the cameras are: KGB Key Ring Camera. USSR. Chrome. Pinhole camera for 4 exposures on special film. Origin: According to information received produced between 1987 and 1990 at the KGB school in Kiev. Start price for the first on is 1900 SEK (appr 210 USD) and for the second one 2200 SEK (appr 240 USD). Quite a lot, I think. More information on the company and auctions: http://www.lpfoto.se/eng/auktioner/auktion_aktuella_sp.asp /peter ___ 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] russian camera?
never heard of them ...but boy...who would think the KGB had an artistic side... 8o) andy -Original Message- From: pinhole-discussion-admin@p at ??? [mailto:pinhole-discussion-admin@p at ???]On Behalf Of Peter Wiklund Sent: Tuesday, November 12, 2002 5:47 AM To: 'pinhole-discussion@p at ???' Subject: [pinhole-discussion] russian camera? Hi, anyone who knows what this is? http://www.lpfoto.se/swe/auktioner/gamla_auktioner/auktionx17/img/big/0441.g if or this: http://www.lpfoto.se/swe/auktioner/gamla_auktioner/auktionx17/img/big/0442.g if The cameras are to be sold at an auction in Stockholm, Sweden Dec 8th. The texts for the cameras are: KGB Key Ring Camera. USSR. Chrome. Pinhole camera for 4 exposures on special film. Origin: According to information received produced between 1987 and 1990 at the KGB school in Kiev. Start price for the first on is 1900 SEK (appr 210 USD) and for the second one 2200 SEK (appr 240 USD). Quite a lot, I think. More information on the company and auctions: http://www.lpfoto.se/eng/auktioner/auktion_aktuella_sp.asp /peter ___ 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] Limited Edition Pinhole Polaroid Camera
--- James Kellar pinh...@jameskellar.com wrote: I was wondering if any one else saw this on ebay? Has any one heard of this camera? Seems a bit over priced? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=1395685792 I'm not sure that overpriced even begins to describe it. g Cheers - george = Handmade Photographic Images - http://GLSmyth.com DRiP Investing - http://DRiPInvesting.org __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2
Re: [pinhole-discussion] Limited Edition Pinhole Polaroid Camera
Haven't heard od it, but it looks very much like a simple plywood (or perhaps even pressed wood) box attached to the front of a standard Polaroid pack film back. The shutter, though well made, seems to be rudimentary. Buying all the parts for this new (including a laser drilled pinhole) should cost no more than about $50 US. I don't see the linited edition status adding any value unless the designer is well known . . . and even then, it's a lot of money for a very plain camera. (It is basically the Polaroid cardboard pinhole camera with the cardboard parts replaced with wood. And the Polaroid version is overpriced at $100.) Mike Vande Bunt James Kellar wrote: I was wondering if any one else saw this on ebay? Has any one heard of this camera? Seems a bit over priced? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=1395685792 James James Kellar Co-manager of the Pinhole Discussion List http://www.???/discussion/ pinh...@jameskellar.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/
