Re: [pinhole-discussion] New to Pinhole
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Re: [pinhole-discussion] New to Pinhole
I think Leezy is right. The f=150 pinhole camera that I use most gives a great exposure indoors at about thirty minutes using film (ASA 100). In this camera the film is only an inch from the pinhole. If your Quaker Oats box (greater distance to the pinhole=darker) can do the same using paper (which is so much slower), then it suggests the pinhole is very big. It may be so big that even a fraction of a second outside darkens the paper the way you describe. Try a smaller pinhole, but be prepared for much longer exposures indoors. Of course, you could make two cameras--one for indoors and one for outdoors. Colin > In a message dated 8/25/01 5:35:14 PM, > ccpear...@home.com writes: > > << Indoors, I'm getting a proper exposure when > exposed for about a half an > hour. > > When I bring the camera outside, and expose for less > than a second, my > picture is totally black with no detail. >> ___ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??? > unsubscribe or change your account at > http://www.???/discussion/ __ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/
Re: [pinhole-discussion] New to Pinhole
--- "Christopher C. Pearson" wrote: > Hello. I apologize for such an amateur question. > > I've attempted to make my first pinhole camera with a Quaker Oaks box. I > poked my pinhole through a piece of tin (the kind made for cooking pans) and > taped it to the Quaker cylinder. I'm using Ilford 5X7 Multigrade 4 paper. > Indoors, I'm getting a proper exposure when exposed for about a half an > hour. > > When I bring the camera outside, and expose for less than a second, my > picture is totally black with no detail. > > What am I doing wrong? If everything is working indoors, then I will rule out light leaks (then again, the strong light outside could make this show more prominently - I'll assume that you have tested for light leaks). If all you did was poke a hole in a piece of tin, you have no way of knowing how large your pinhole size is. This being the case, I would make another pinhole, sized properly for your camera. I listing of sizes can be found at http://members.home.net/hmpi/Pinhole/Articles/Aperture/pin_aper.htm. If you are not sure how to make one, you can get full instructions at the Pinhole FAQ, located at http://members.home.net/hmpi/Pinhole/Articles/FAQ/pin_faq.htm. Cheers - george = Handmade Photographic Images http://members.home.net/hmpi/ __ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/
Re: [pinhole-discussion] New to Pinhole
Hi: A good diagnotic test would be to take the camera outside loaded with paper. Leave the pinhole shut and leave the camera outside for a few minutes. Develop the paper. If any of it is black you likely have a light leak in the camera - probably the lid. If the camera has a light leak the paper is getting fogged in the camera. If enought light is getting into the camera it would turn the paper black. The reason this may to be happening inside is that the light intensity inside is not bright enough to significantly fog the paper. I often do this with a new camera to make sure it doesn't have any light leaks. On Sat, 25 Aug 2001, Christopher C. Pearson wrote: > Hello. I apologize for such an amateur question. > > I've attempted to make my first pinhole camera with a Quaker Oaks box. I > poked my pinhole through a piece of tin (the kind made for cooking pans) and > taped it to the Quaker cylinder. I'm using Ilford 5X7 Multigrade 4 paper. > Indoors, I'm getting a proper exposure when exposed for about a half an > hour. > > When I bring the camera outside, and expose for less than a second, my > picture is totally black with no detail. > > What am I doing wrong? > > Thanks for listening, > Christopher > > > ___ > 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] New to Pinhole
- Original Message - From: "Christopher C. Pearson" > Hello. I apologize for such an amateur question. Don't worry, we all are pinhole AMATEURs here. I am not a professional, I am an amateur... Amateur is the French word for LOVER. my paraphrasing of Imogen Cunningham's words. > I've attempted to make my first pinhole camera with a Quaker Oaks box. I > poked my pinhole through a piece of tin (the kind made for cooking pans) and > taped it to the Quaker cylinder. I'm using Ilford 5X7 Multigrade 4 paper. > Indoors, I'm getting a proper exposure when exposed for about a half an > hour. > > When I bring the camera outside, and expose for less than a second, my > picture is totally black with no detail. You most likely have light leaks. Make sure your box walls and lids are completely opaque to light and that there are no light leaks when closed, the only light leak should be the pinhole! As for the exposure: I wish I could give you a number of seconds or range of time (10 - 40 seconds, for instance) you can use, but they are as useless as if I tell you to use 1/8 second or any other time or range of time for when you use your glass lens camera. Time alone is nothing. Exposure is not just time, it is a combination of time and aperture. You can practice and practice pinhole imaging with your camera set up until you get a good idea of how fast it is under different light conditions (perfect technique for many). But if you are like me, with not a lot of time to practice and/or not a lot of money to expend on film/paper and rather want to have a more precise point of departure (exposure time wise), then, you have to know the f/stop of your set up. Unfortunately, to know the f/stop of your pinhole camera, the pinhole has to be measured. Not all of us have a device to directly do that measurement. Luckily, there are ways to estimate and also ways to directly measure the pinhole diameter. Some of then include actually measuring its diameter with a ruler in graduated in millimeters and a magnifier (works well when the pinhole is really big). You could also do measurements by projecting the pinhole with either an enlarger or a slide projector or you could even use a cheap flat bed scanner. I wrote a humble article on how to do this, if interested you can find it in my pinhole page at: http://members.home.com/penate/pinhole.html While there, check also the article on Pinhole exposure, which has a reciprocity correction table for the paper you are using. Guillermo
Re: [pinhole-discussion] New to Pinhole
In a message dated 8/25/01 5:35:14 PM, ccpear...@home.com writes: << Indoors, I'm getting a proper exposure when exposed for about a half an hour. When I bring the camera outside, and expose for less than a second, my picture is totally black with no detail. >> It sounds to me like the pinhole is too large. Decent exposures indoors might take as long as 4 - 7 hours and outside 15 - 60 sec. in bright sun (using Ilford Multigrade paper in a Quaker Oats box). Just a guess. leezy
