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Micah in NC
Joined: 26 Jun 2003
Posts: 94
Location: North Carolina
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 Posted: Mon Sep 08, 2003 3:14 am Post subject: |
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Harry & Les,
Thanks very much! Les, since I'm shooting only Polaroid film right now, it'll be a cinch to see whether my exposure is right or not. And Harry, I'll have to put that formula to work!
Gosh, I'm learning a lot lurking around on this board...
Thanks,
Micah in NC
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On 2003-08-27 19:35, worldphoto wrote:
Micah
That can all be calculated very simply.
Magnification equals length of bellows extension beyond infinity divided by the focal length of lens.
M = E/F
For example, to work in inches, change 127mm to 5" and then a 10" extension beyond the camera's infinity setting would make for a 2X full size magnification. You would need around 15" from the film plane or ground glass to the lens.
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45PSS
Joined: 28 Sep 2001
Posts: 4081
Location: Mid Peninsula, Ca.
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| Posted: Tue Sep 09, 2003 1:31 am Post subject: |
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Harry,
Thanks for the link. I'll do some reading and see if I can get the math routines working again.
Charles
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