Originally Posted by tim k
So, thinking out loud. With a 480mm I'm good for 1:1 with 40 inches. With a 600mm I'd need closer to 4 ft for 1:1.
40 Inches is starting to sound about right.
Tim, I've done quite fine with 36" of bellows. Remember the lens coverage increases as you get closer and extend your bellows. I've done some nice 1:1 with my 12" Gerogon.
Now for my 14x17 I'm thinking 48".