John: Please describe your technique with making and verifying a .006" pinhole. I have found it difficult to make pinholes smaller than about .015". David Balfour --- john yeo <jonn...@thegrid.net> wrote: > A few days ago I made a pinhole body cap for my > canon AE-1. I made the pinhole as small as I could, > it ended up .0065 +/- .0005" f/270. Would using > one of the formulas to determine the optimal size > work better for such a small focal length? Or does > that only apply to longer focal lengths. Larry's > site gives .011" as the optimal size. That would be > better for handheld exposure and looking through the > veiwfinder but I want the sharpest image possible > since it's such a small negative. > > After looking through the viewfinder for a few > seconds, it's pretty easy to see the image. I have > a rubber eye-cup that really helps block out excess > light. For my first roll I used delta 3200. Using > the sunny 16 rule, I figured out exposure to be > about 1/15 sec. I have since made a dial > calculator, and it says it would be between 1/11 and > 1/8 sec. Looking at the negatives, they could have > used the extra stop. Flare didn't seem too bad > through the viewfinder, but it is awful on the > negatives. I don't know what the vertical line is > on some of the frames (17,18,28,29) Maybe some of > you can provide an answer to that. > > I walked to the post office and took the camera with > me. Just took pictures of whatever. I even shot > some cars moving at 45mph!!! All exposures except > for the first few were hand held. I bracketed a > bit, and the exposures range from 1/4 to 1/30. They > are actually sharper than what the contact sheet > looks like... my scanner isn't very good. > > here's a scan of the contact sheet: > low res 64kb > http://holgamods.blinkk.net/images/ph35cs-lowres.jpg > high(er) res 192kb > http://holgamods.blinkk.net/images/ph35cs-hires.jpg > > John > > >
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