This is a contrived test of center and corner sharpness of various 50mm lenses, SLR and rangefinder. I decided to compare the performance of my 1938 Leitz Summar before selling it. The test was fairly simple: I took two pictures of a Schneider wooden cuckoo clock, one at the center of the frame, and one at the edge (but not corner). All photos were taken on a Sony A7-II, with IBIS enabled, and manual focus using the zoom-in button. Distance was about 3 meters (typical portrait or half-body distance) and all lenses were wide-open to maximize aberrations.
Here's the clock face at the center of the image (rotated 90 degrees for convenience):
And here is the same clock face at the edge of the image (also rotated 90 degrees):
And here are the center images:
Here's the clock face at the center of the image (rotated 90 degrees for convenience):
And here is the same clock face at the edge of the image (also rotated 90 degrees):
And here are the center images:
Canon 50mm f/1.8 LTM
Industar-61LZ 55mm f/2.8
Jupiter-3 50mm f/1.5 Sonnar copy
Jupiter-8 50mm f/2 Sonnar copy
Carl Zeiss Jena Pancolar 50mm f/1.8
Contax Carl Zeiss Planar 50mm f/1.7
Canon 50mm f/1.8 STM
Ernst Leitz Wetzlar 50mm f/2 Summar (1938)
Pentax Super-Takumar 55mm f/1.8
Pentax Super-Takumar 50mm f/1.4 (7-element)
And the edge images:
Canon 50mm f/1.8 LTM
Industar-61LZ 55mm f/2.8
Jupiter-3 50mm f/1.5 Sonnar copy
Jupiter-8 50mm f/2 Sonnar copy
Carl Zeiss Jena Pancolar 50mm f/1.8
Contax Carl Zeiss Planar 50mm f/1.7
Canon 50mm f/1.8 STM
Ernst Leitz Wetzlar 50mm f/2 Summar (1938)
Pentax Super-Takumar 55mm f/1.8
Pentax Super-Takumar 50mm f/1.4 (7-element)