1. The optimal distance for a .013" pinhole is about three inches, and the f stop would be about 230. You should be able to figure your exposure out with that, by comparing with a metered f stop. A "black cat" brand guide will help enormously. see it at www.pinholeresource.com 2. Technical answer is that the falloff of light intensity off axis is equal to the original intensity times the fourth power of the cosine of the angle off axis. The simple answer is yes. You need a better match between the distance to the film and the size of the pinhole. Bigger is better. 3. Sounds like old dried up fiberbased paper. Yes a hot press will help. One used to be able to get print flattener solution, which was basically glycerine. Don't know if it's available any more. 4. I don't know the ethical answer, but in reality large city sewage systems can handle the occasional amateur dump. ----- Original Message ----- From: "Bre Pettis" <pett...@yahoo.com> To: <pinhole-discussion@p at ???????> Sent: Tuesday, August 20, 2002 7:51 PM Subject: [pinhole-discussion] 4 questions from a beginner
> Hi, I've become obsessed with pinhole photography and > I've got a bunch of questions that I need help with. > I'm sorry for so many questions at the same time. > > Question 1 > > I've turned an old autographic camera into a pinhole > camera. I've got a .013 needle hole and 1" from > the hole to the film. I've got it loaded with 400 > speed b&w film. So my question is where should I > start? In my paper as film pinhole cameras I start at > about a minute in sunlight. How long should I try for > an exposure on a sunny day? Am I right in gauging the > f stop at f/77? I've got a light meter, should I use > it and should I make any adjustment for using a > pinhole? > > > Question 2 > > I've made a 250 sheet photo paper box pinhole camera > with a .013 hole. I'm not getting nearly as much > light around the edges as in the middle. I thought it > might be the pinhole, so I made another with the same > problem. Is lack of light on the edges normal? > > Question 3 > > A friend gave me a box of ilford ilfobrom 4.1P paper. > It works fine except that the edges are curled up. > Any way to fix that? Would putting it in a hot press > thing help? Also, does anybody know what the > qualities of this paper are in relation to other > papers? > > Question 4 > > I'm sure this is a repeat question, but do I take > developing chemicals to the haz waste pickup place or > is Seattle's waste division capable of handling the > chemicals down the sink? > > Thanks, > > Bre Pettis > > > __________________________________________________ > Do You Yahoo!? > HotJobs - Search Thousands of New Jobs > http://www.hotjobs.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/ >
