Quote Originally Posted by Shawn Dougherty View Post
You're welcome. =)

Here is a great resource for modern lenses:
http://www.ebonycamera.com/articles/lenses.html

Scroll down the chart under glossary of terms.

"The flange focal distance of a lens is the distance from the rear surface of the lens shutter (i.e. the front surface of the lensboard) to the focal plane (i.e. the film plane) when the lens is focused at infinity."
I always assumed the flange focal distance was pretty close to the indicated focal length, exept of course for telephotos.