How can you figure out how much bellows extension you need to focus a lense from say 3 feet to infinity? The lense that I use most often is a 90mm. Is it as s imple as at infinity it has to be 90mm away from the ground glass? If so then h ow do you figure out for close ups? Is there a chart or equation? Thanks in ad vance for any help that anyone can give on this subject.
Bookmarks