Quote Originally Posted by EASmithV View Post
I noticed that B&H has sets of close up filters that will fir my 300mm, and i'm wondering if that would be good to use for portraiture... Might save on bellows factor? Or just give me a better working distance?

Anybody ever tried this before?
For example a +1 close up lens will be 1000mm focal length. Add that to 300mm you have (which is +3 diopter) and you get a +4 diopter lens. Focal length = 250mm. That may help you or may not.