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

Quote:

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.

Harry,
Thanks for the link. I'll do some reading and see if I can get the math routines working again.
Charles