Quote Originally Posted by KenFretz View Post
Take the camera outside and focus on a distant object (you are trying to focus it at infinity). The distance from the front of the lens board to the inside of the ground glass should be the focal length of the lens.

Ken
So, when I have the camera open with full bellows extended (it being a draw-back camera), basically it is the length of the full bellows extention from lens board to ground glass?

Marcus