Quote Originally Posted by Dan Fromm View Post
So the longest lens you can use is 9" and a bit shorter would probably be better.
Hi Dan,

Not meaning to quibble, but...

If you use 1:1 as the close-focus limit, your maximum lens FL is about 1/2 the bellows draw, which would be 18" in this case.

The other 2xFL (@ 1:1) is in front of the lens and is not involved in the bellows draw calculations.

- Leigh