Quote Originally Posted by Mark Sawyer View Post
I'm always amused by the "bellows extension factor" explanations. There's no such thing. Just divide your bellows extension (lens center to ground glass) by the diameter of your aperture. That's your working f/stop.

But no, you have to divide this by that, square it, and use the "exposure compensation factor" to multiply your exposure time.

All these expert internet photographers, and none of them know what an f/stop actually is...
Well, hanging over a cliff on a windy coastline I'd much rather measure my bellows draw and consult my table than measure entrance pupil

But, to each his own. There is more than one way to skin a bellows!

My favorite Photo Phalshood: The Zone System is precise.

Doremus