Thanks to everyone who enlightened me on their approaches to
extention tube aperture calculations (both via the list and by private
E-mail). There are a lot of ways to look at the question but they all
converge to about the same answer -- in my case the f/2 lens
becomes somewhere around f/4 wi
I didn't follow your math too closely, but I will give you the
correct formulae for figuring the extension factor as applied to
LF cameras.
First, compute the image magnification (M) by dividing the lens
to subject distance into the lens to film distance, measuring
from the lens aperture position
using a camera with ttl flash is the easiest way to get good results
JCO
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Brent Hutto
> Sent: Tuesday, November 27, 2001 8:10 PM
> To: [EMAIL PROTECTED]
> Subject: Extension Tubes for Closeup Photograph
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