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 <jonnieo@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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Received on Thu Jan 11 19:09:43 2001
This archive was generated by hypermail 2.1.8 : Mon 13 Dec 2004 - 23:33:17 PST
