RWR wrote:
The answer is in the post you replied to. (For the Rollieflex, it would be 80mm).
Edit - The f/3.5 Planar is 75mm (I should know better, I have one! :oops: )
There are 50 and 55 mm f/4 wide angle and 135 mm f/4 tele versions if you can find them, but the 80 mm f/2.8 and 3.5 are the most common.