Quote Originally Posted by Joe Lipka View Post
All these formulae and stuff are wonderful things to know. but we all know that the appropriate distance for a photographer looking at another photographer's photograph is to have your nose right on the glass.
If you are of an appropriate vintage, you will either take your glasses off or push them up on your forehead before you stick your nose on the glass.
Come on, you know this is true.
I found myself viewing some original, very large, Brad Washburn ariel photos of mountains from just a few inches away (5 or 6). It was the only way to appreciate the fine detail (w/glasses off).

P.S. I have a close cousin who helped design one of Mr. Washburns ariel camera film advance mechanisms - not such an easy task with LF roll film.