Re: [pinhole-discussion] Willarney's BB Idea
- Original Message - From: michael_georg...@trendmicro.com To: pinhole-discussion@p at ??? Sent: Thursday, March 13, 2003 6:12 PM Subject: [pinhole-discussion] Willarney's BB Idea Philip Willarney, I salute your brilliantly nutty idea! (And am not surprised Ms. Merrill, our associate in wierdness, came out to comment!). Now, given that an airgun bb has a diameter of .175, we'll need Guillermo to tell us how far apart the inner sides of the box need to be. Without taking my trusty slide ruler out to make the calculation, I can tell you it would need to be like the mother of all pinhole cameras (or not). Guillermo
[pinhole-discussion] Re: weird idea for a pinhole camera
Philip willarney pwillar...@yahoo.com wrote: Stand away from the box, and fire a bb gun through the middle of one of the sides. If the board is thin enough, the bb should go through the box, through the first film, through the second film, and out again, causing 2 pinholes to be formed and simultaneously taking a picture in both directions at the same time! Strange enough to get me thinking about it. The typical BB is approximately 4.5 mm in diameter. In passing through cardboard it may not punch a perfectly clear hole, with the ragged edges of the cardboard collapsing back towards the center. A more circular hole may be possible if a lead pellet with a flat nose is used, though there may be some deformation of the pellet after passing through the first cardboard/film layer. The idea is just crazy enough to warrant some testing and sounds like a fine excuse to combine two hobbies. John Bolgiano --
[pinhole-discussion] Willarney's BB Idea
Philip Willarney, I salute your brilliantly nutty idea! (And am not surprised Ms. Merrill, our associate in wierdness, came out to comment!). Now, given that an airgun bb has a diameter of .175, we'll need Guillermo to tell us how far apart the inner sides of the box need to be. Michael Georgoff San Jose, CA
[pinhole-discussion] Agfa Multicontrast Premium ASA
Hi, Here is my problem: I use Agfa Multicontrast Premium, in 2 different pinhole cameras (one with 95mm focal lenght, f/290), and the second with 25mm focal lenght, f/155) and using the same light-meter and the same correction factors for reciprocity (charts for exposure from Mr.Pinhole Calculators, and factors for reciprocity, from G.Penate's and Penultimate's websites). The manufacturers chart, for when using the paper under the enlarger light, says that the paper has an ASA of 400p (p meaning paper?) when is used without filters, ASA160p when using contrast filters from 00 to 3.5, and ASA80p, when using with filters from 4 up. Now, when I use the first camera, I get the best exposures when calculate them as if the paper is ASA64, but this is variable depending on the day (always measuring something close to a medium gray). For the second camera (a plastic 35mm film canister), best ASA is 125. In many Internet sources I've found that some people uses ASA 6 for paper and a very simple chart for reciprocity (1'', 10'' and 100'', corrected opening up 1,2 or 3 stops), but this definitely makes grossy underexposed photos in my cameras. So, 1-what's the ASA of a paper? 2-Can, the same paper behave different just because the focal lenght differs (speaking about ASA, not exposure. Exposure will be compensated with the different aperture)? 3-Is there any female hormones in the manufacturing of the paper, so they change some days during the month? (no answers expected for question 3) Thanks for your help Marcelo Marcelo Mammana __ Do you Yahoo!? Yahoo! Web Hosting - establish your business online http://webhosting.yahoo.com
Re: [pinhole-discussion] weird idea for a pinhole camera
In the revised edition of Renner's Pinhole (I can't remember where and too lazy to look) someone did what you are attempting as a self-portrait - Very Cool. I believe it was a much more powerful projectile though. Don --- Philip willarney pwillar...@yahoo.com wrote: pinhole-discussion@p at ??? The martial mood of the country led by some strange path to the following thought: Take a light tight cardboard box made of fairly thin cardboard: in the dark, securely tape film to two inner facing sides, and seal box. Take box outside, set it somewhere with a weight on top of it (a brick or rock). Stand away from the box, and fire a bb gun through the middle of one of the sides. If the board is thin enough, the bb should go through the box, through the first film, through the second film, and out again, causing 2 pinholes to be formed and simultaneously taking a picture in both directions at the same time! After a suitable exposure time, drop a slightly larger box on top of the first box to end the exposure. Has anyone done anything like this? Anyone want to try it and let me know how it works out? I haven't had a bb gun for, oh, 20 years, so I don't have the technology available... pw __ Do you Yahoo!? Yahoo! Web Hosting - establish your business online http://webhosting.yahoo.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/ __ Do you Yahoo!? Yahoo! Web Hosting - establish your business online http://webhosting.yahoo.com
