I posted such a thread on the Rangefinder Forum, but want to show it also here hoping that some of you have not been to the RFF to see this thread.
It is not so much a guessing game but I find it informative to see the small differences between the 50mm lenses. Only the I61 lens was a trashed one and it shows like the Holga effect in one of the photos. I used a Bessa T hand-held at f 4.0 and shutter speed 1/1000 with lens hood and Fujicolor 100 film.
Lenses:
A. JapaneseA.1. Canon 50mm/1.2
A.2. Canon 50mm/1.8 (Serenar)
A.3. Canon 50mm/2.8
A.4. Nikon 50mm/2
B. FSUB.1. J-3 50mm/1.5
B.2. J-8 50mm/2.8
B.3. I61L 50mm/2.8
B.4. I61 50mm/2.8
C. GermanC.1. Rigid Summicron 50mm/2 (first version)
C.2. Collapsible Summicron 50mm/2
C.3. Zeiss Sonnar (pre-war) 50mm/2
C.4. Elmar 50mm/3.5 (pre-war)
Here is the link to the 12 photos. I hope you like the results.
http://www.photo.net/photodb/folder?folder_id=585097