mllanos1111
Well-known
I'm looking to purchase a 50 Summicron R. I see all kinds of version out there.
Are there ones to look for and ones to stay away from?
Are there ones to look for and ones to stay away from?

Picking up a Leicaflex SL2, will mostly be shooting B&W




A 50mm f 2.0 lens on a 35mm film has an estimated 3.75cm DOF at 1m, say 1.75cm in front and 2 cm at the back of the plane of best focus. I have the specific SL2/Summicron tests in the office, but I remember it was off ( I think backfocus) by at least 3cm, so while you are focusing at 100cm, and your DOF extends from 98,25 to 102cm, in reality your acceptable sharpness will be from 101,25 to 105cm.
You can see the problem as explained in this thread:
http://www.rangefinderforum.com/forums/showthread.php?t=137012
...more critically it does not suffer from focus shift which the first one does.