I think we can all agree that most primes have a sweet spot in terms of focal distance and aperture. If you've wondered how the 50ish MM lenses stack up, this is as scientific of a test as I'm interested in doing. I think taking pictures of paper charts is a silly waste of time and resource. If I want to know how good a lens is, I'll go out and take real pictures with it.
Index of /Photos/50mmShootout
Lenses:
Pentax A 50mm f1:1.7
Pentax A 50mm f1:1.4
Pentax A 50mm f1:1.2
Pentax K 55mm f1:1.8
Pentax DA*55mm f1:1.4
Voigtlander 58mm f1:1.4
There are no special pictures here, just a progression of shots from Wide open to fully stopped down. All photos were taken in M mode and the meter centered as best as possible (similar to using Green Mode but I didin't). All photos received Exactly the same processing. That is, I processed one in ACR and Copied the entire settings set to the rest. All photos were taken from exactly the same position, SR on, No tripod, and with one exception, ISO 80 on the K5. Exifs are in tact on all photos. First in each sequence is wide open and each progression is closed down one full stop. With the exception of the DA*55, these are all manual focus at or near infinity. The DA*55 was allowed to autofocus and the same target was used each time.
With these tests, I am looking at the steps on the pole to judge. Use your own criteria if you wish, that one works for me. I've chosen a winner but won't tell you which I think it is. I thought about not even telling which lens for which photo but that requires too much record keeping on my part, and I just don't care to go that far.
I'll do the screw mounts in my collection at a shortly later date (Tak 55f1.8, Tak 50f1.4, Mamiya 55f1.4, Sears 55f1.4).
Last edited by Unregistered User 8; 08-04-2017 at 11:50 PM.
Reason: remove swearing