Re: [pinhole-discussion] Polaroid Reciprocity - new question
Hi all, I will be using polaroid type 669 in a pinhole utilizing daylight. Has anyone done any color correction tests so that I may bave this information before I start? Specifically, what gel do I need to correct for any overall color casts? My goal is to have the pics as neutral as possible. Thanks in advance, Don __ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/
[pinhole-discussion] RE: Polaroid recopicity failure
Polaroid is not my recording medium of choice, but without a 4x5 darkroom, Polaroid is a practical choice, and scan. Most of my pictures on PinPLUS side of www.huecandela.com are Polaroid. Have found that Polaroid Polapan 54 for sunlight and Polaroid Polapan 72 for overcast, full shade, and flash for macro pinhole pictures works well for direct pinhole picture prints. After Three shoots/test of the below Polarid, my formula for simple recopicity failure is below. Polaroid Polapan 54 seconds ^1.16for 1 sec use ((2 seconds)^1.16)/2 Polaroid Polapan 72 seconds ^ 1.24 for 1 sec use ((2 seconds)^1.24)/2 or 1sec 1.5sec 2sec 3sec 4sec Polaroid Polapan 54 1.1 1.6 2.2 3.6 5.6 Polaroid Polapan 72 1.1 1.7 2.4 3.9 5.6 6sec 8sec 12sec 16sec 24sec Polaroid Polapan 54 8.0 11.217.924.939.9 Polaroid Polapan 72 9.2 13.221.831.151.5 Paul Prober
Re: [pinhole-discussion] Polaroid Reciprocity
Guillermo, The corrected time you gave me worked very well. Thank you! However, I want to clarify one thing... Did you go to the Polaroid website to get the numbers to plug into the WinCurveFit program? Did you just pull the numbers from the displayed graph and plug them into the program and extend the curve? Is that how that works. Thanks again! Jason Russell WISH-TV Indianapolis, IN If you go any faster we're gonna travel back through time. - Original Message - From: Guillermo pen...@rogers.com To: pinhole-discussion@p at ??? Sent: Tuesday, October 29, 2002 5:06 PM Subject: Re: [pinhole-discussion] Polaroid Reciprocity - Original Message - From: Jason Russell jruss...@wishtv.com Will the equation change with different types of film? The equation is just a math model of the reciprocity correction curve, the latter is just a graphic representation of the discrete values, either given by manufactures (like the ones given by Polaroid for the film in question - Polapan type 72) or obtained by us thru experimentation. Since each film has its own reciprocity characteristics, each film would have its own equation. Or do I just plug the indicated time into the equation to get a starting point? If it does change, which numbers will be different and how do I figure them out All the coefficients change. You can find them by doing a Regression analysis of the known reciprocity correction values, I use the Least Square polynomial method, here is a hint on how to do that: http://www.efunda.com/math/leastsquares/lstsqrmdcurve.cfm , for those of us confused by the above, using a program like WinCurveFit http://www.krs.com.au/wcf.html is a good thing, that is what I used to give you the answer BTW. Guillermo ___ 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] re:pinhole nude
Dai,I just visited your website and found it too, inspirational just wanted to say that to you Robin - Original Message - From: dain...@aol.com To: pinhole-discussion@p at ??? Sent: Tuesday, October 29, 2002 9:58 PM Subject: RE: [pinhole-discussion] re:pinhole nude Hi Robert, I the final images are printed on Cachet Multibrom Variable Contrast Fiber Base Double Weight Matte Paper. The paper is VERY nice but availability is spotty. I got my supply from BH. I have some bad (photo/scan) images of the camera here: http://www.justdai.com/cam1.jpg http://www.justdai.com/cam2.jpg It will accommodate standard 2X3 Graphic backs which are available in 6X9, 6X7 and 6X6 120/220 film formats. I also built two Polaroid film backs, one that will accept 669-type pack film and the other SX-70/600 integral film. Cheers, Dai. From: r...@aarp.org (Fox, Robert) Dai, Those are very impressive and beautiful images. Thanks for the inspiration! What type of paper are they printed on? I know if they look that good as tiny compressed jpegs, the real prints must be stunning. Do you have any link to show what your homemade camera looks like? Regards, R.J. - Daisuke Nakabayashi dain...@aol.com http://www.justdai.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/
Re: [pinhole-discussion] Polaroid Reciprocity
- Original Message - From: Jason Russell jruss...@wishtv.com Will the equation change with different types of film? The equation is just a math model of the reciprocity correction curve, the latter is just a graphic representation of the discrete values, either given by manufactures (like the ones given by Polaroid for the film in question - Polapan type 72) or obtained by us thru experimentation. Since each film has its own reciprocity characteristics, each film would have its own equation. Or do I just plug the indicated time into the equation to get a starting point? If it does change, which numbers will be different and how do I figure them out All the coefficients change. You can find them by doing a Regression analysis of the known reciprocity correction values, I use the Least Square polynomial method, here is a hint on how to do that: http://www.efunda.com/math/leastsquares/lstsqrmdcurve.cfm , for those of us confused by the above, using a program like WinCurveFit http://www.krs.com.au/wcf.html is a good thing, that is what I used to give you the answer BTW. Guillermo
RE: [pinhole-discussion] re:pinhole nude
Hi Robert, I the final images are printed on Cachet Multibrom Variable Contrast Fiber Base Double Weight Matte Paper. The paper is VERY nice but availability is spotty. I got my supply from BH. I have some bad (photo/scan) images of the camera here: http://www.justdai.com/cam1.jpg http://www.justdai.com/cam2.jpg It will accommodate standard 2X3 Graphic backs which are available in 6X9, 6X7 and 6X6 120/220 film formats. I also built two Polaroid film backs, one that will accept 669-type pack film and the other SX-70/600 integral film. Cheers, Dai. From: r...@aarp.org (Fox, Robert) Dai, Those are very impressive and beautiful images. Thanks for the inspiration! What type of paper are they printed on? I know if they look that good as tiny compressed jpegs, the real prints must be stunning. Do you have any link to show what your homemade camera looks like? Regards, R.J. - Daisuke Nakabayashi dain...@aol.com http://www.justdai.com -
Re: [pinhole-discussion] re:pinhole nude
- Original Message - From: Paul Prober pro...@silcom.com Note! By using flash there is no recopicity failure. The effect is the same as opening the shutter for 1/1,000 of a second each time the flash is fired. Sure, there is a reciprocity like effect, its name is Intermittency Effect. Guillermo
Re: [pinhole-discussion] re:pinhole nude
Beautiful work! Thanks for more insight about flash and pinhole. Catherine --- dain...@aol.com wrote: Hi Folks, I did a series several years ago using a portable Vivitar flash and a pinhole camera shooting nudes. A sample can be viewed here: http://www.justdai.com/topo/index.html The final images are 11X14 from 6X7 120 negative. Shooting pinhole with flash is astonishingly easy and rather liberating since exposure time and the use of a tripod goes out the window... Exposure is determined by flash to subject distance like in lensed photography, and since the effective shutter speed is now the duration of the flash, there is no need to support the camera on a stable base. Cheers, Dai. From: pro...@silcom.com (Paul Prober) Yes! There is another way. That is to use flash. My website at http://www.huecandela.com/hue-x/Pin-html/PP_h-pwr1.html has pictures that are 6 inches to over 4 1/2 feet from a f/250 pinhole in one picture. Plus information on using flash units with many firings for one picture. Also a complete set of flash tables for pinhole photography is found at http://www.huecandela.com/hue-x/Pin-html/PP_flash1.html with tables for ASA 100 to 3200 15ws-8000ws and f/2.8-f/4000 with flash to subject distances. Note! By using flash there is no recopicity failure. The effect is the same as opening the shutter for 1/1,000 of a second each time the flash is fired. Many flash firings may be required to meet the total light power. Also daylight color film will work. Normal flash units with recycling time for four flash firings would take less than 3 minutes. Subdue lighting can be present and be invisible to the film. Paul Prober - Daisuke Nakabayashi dain...@aol.com http://www.justdai.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/ = Catherine Just Photography Weddings~Portraits~Fine Art http://www.catherinejust.com 619.294.3195 Don't just state your intent, Live it. ~Jerry Seiner Jr. __ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/
RE: [pinhole-discussion] re:pinhole nude
Dai, Those are very impressive and beautiful images. Thanks for the inspiration! What type of paper are they printed on? I know if they look that good as tiny compressed jpegs, the real prints must be stunning. Do you have any link to show what your homemade camera looks like? Regards, R.J. -Original Message- From: dain...@aol.com [mailto:dain...@aol.com] Sent: Tuesday, October 29, 2002 12:15 PM To: pinhole-discussion@p at ??? Subject: Re: [pinhole-discussion] re:pinhole nude Hi Folks, I did a series several years ago using a portable Vivitar flash and a pinhole camera shooting nudes. A sample can be viewed here: http://www.justdai.com/topo/index.html The final images are 11X14 from 6X7 120 negative. Shooting pinhole with flash is astonishingly easy and rather liberating since exposure time and the use of a tripod goes out the window... Exposure is determined by flash to subject distance like in lensed photography, and since the effective shutter speed is now the duration of the flash, there is no need to support the camera on a stable base. Cheers, Dai.
[pinhole-discussion] Re: authentic space
whatever are everyone elses thoughts on authentic space? steve Steve, might this refer to the difference between authentic to perhaps, contrived space? I have found the certain areas or places have a feel to them, a feel that I might try to cpature with a photgraph. These areas, to my sensitvity, are usually unique to their surroundings, are lit in a particularly enriched way and are all authentic, if I read the definition correctly. I have tried to force a feeling with a photgraph and found it rarely works for me, sometimes the best photos are where you find them, a kind of photgraphic Tao. Just be the camera, open yourself up to the experience and let it happen. I like pinhole photography for that reason, the ritual that ends in image, as someone on this list once put it so eloquently, to me pinhole is somehow closer to authentic (purer, maybe?) than digital may be, but that's just me. I'm just an average, blue collar, work-a-day schmuck, little formal experience in either art or photography (some would say it shows), but I do know what appeals to me. I like the theory of it, something to keep in mind, thanks for the posing the question. David Walters
Re: [pinhole-discussion] Polaroid Reciprocity
Guillermo, Will the equation change with different types of film? Or do I just plug the indicated time into the equation to get a starting point? If it does change, which numbers will be different and how do I figure them out? Thanks Jason Russell WISH-TV Indianapolis, IN If you go any faster we're gonna travel back through time. - Original Message - From: Guillermo pen...@rogers.com To: pinhole-discussion@p at ??? Sent: Monday, October 28, 2002 6:43 PM Subject: Re: [pinhole-discussion] Polaroid Reciprocity - Original Message - From: Jason Russell jruss...@wishtv.com I was wondering if anyone could help me with Polaroid Reciprocity. I just recently started shooting with a Santa Barbara (2 inch Super Wide) with a Polaroid back. Right now I'm shooting with Polapan 400 BW (72). I've done most of my shooting outside and the exposures have all been less than six seconds. I wanted to try shooting inside under much lower light. I'm just not sure how much I need to compensate for reciprocity. I checked out the info on Polaroid's site, but I'm still a unclear. Has anyone else shot with this film or a similar film that could give me an idea of how much time to add. The shot I want to shoot right now, by my calculations is about 2 and a half minutes without compensating for reciprocity. Jason: I have not used the film, nevertheless here is my suggestion: Short answer: for indicated 2.5 minutes you should give 17 minutes 3 secs. Long answer: As you can see on the Reciprocity Performance chart, the effective film speed decreases (as expected) as the indicated exposure time increases, the exposure adjustment column tells you how many stops you should increase the indicated time. For 4 secs, for instance, the exposure adustment is 1 stop, that means you should double the time to 8secs. I made some math calculations (best curve fit) and they predict that when the indicated exposure time is 150secs (2.5minutes), the effective film speed will be ISO-58.6, which in turn will need an exposure adjustment of 2.77 stops, for a total of 1023secs or 17 minutes 4 secs (150 x 2^2.77 = 1023). If you want some other times, use the following formula: T = corrected time I = indicated time * = multiplication sign T = ( 0.021 * I * I ) + ( 3.708 * I ) - 4.89 CAVEAT: the above suggestion is just an educated starting point based on the Polaroid published information, YMMV. Guillermo ___ 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 nude
Yes! There is another way. That is to use flash. My website at http://www.huecandela.com/hue-x/Pin-html/PP_h-pwr1.html has pictures that are 6 inches to over 4 1/2 feet from a f/250 pinhole in one picture. Plus information on using flash units with many firings for one picture. Also a complete set of flash tables for pinhole photography is found at http://www.huecandela.com/hue-x/Pin-html/PP_flash1.html with tables for ASA 100 to 3200 15ws-8000ws and f/2.8-f/4000 with flash to subject distances. Note! By using flash there is no recopicity failure. The effect is the same as opening the shutter for 1/1,000 of a second each time the flash is fired. Many flash firings may be required to meet the total light power. Also daylight color film will work. Normal flash units with recycling time for four flash firings would take less than 3 minutes. Subdue lighting can be present and be invisible to the film. Paul Prober
