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Testing my lenses
with the One Dollar Resolution Chart
(small lens edition)


 
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The One Dollar Resolution Chart


Once again playing with my one dollar resolution chart, in this case to see which lens I should keep: the very cheap Industar 61 for the M39 screw mount (52mm f/2.8, I believe this copy is from 1969) or the much more expensive Leitz Summicron-C 40mm f/2.0 for the Leica M mount (my copy is from 1973). They are both very small rangefinder lenses with a relatively "normal" field of view. Whichever I pick will be my walkaround and casual tourist lens: the one I bring with me when I don't want to carry lots of gear, just one small camera with one small lens.

I also added the Leitz Summilux-R 50mm f/1.4 to the test, to have a basis for comparison (it's one of my best lenses, and it has a similar FoV to these two; it's much bigger and heavier, though, so they are not substitutes).

I tested them all on the a7S (12 Mpix full frame sensor) and on the NEX-5N (16 mpix APS-C sensor), always in stills mode, with shutter delay and all the usual precautions.

Conclusion: I'm selling the Summicron-C 40mm f/2.0. It's a stop faster than the Industar 61 and clearly smaller (maybe half an inch shorter), and it's really sharp in the center, but in the corners it's too soft for my test, and has very bad field curvature (so bad that I actually noticed it in the real world the very first time I took it out). And it costs around ten times as much as the much more "boringly OK all around" Industar 61.





please visit my equipment recommendations




















Sony a7S




CENTER - 100% crops
 
 
f/1.4
f/2.0
f/2.8
f/4.0
f/5.6
f/8
f/11
f/16
Leitz 50
Leitz 40
-
Industar 61
-
-





CORNER (focusing at corner) - 100% crops
 
 
f/1.4
f/2.0
f/2.8
f/4.0
f/5.6
f/8
f/11
f/16
Leitz 50
Leitz 40
-
Industar 61
-
-





CORNER (focusing at center) - 100% crops
 
 
f/1.4
f/2.0
f/2.8
f/4.0
f/5.6
f/8
f/11
f/16
Leitz 50
Leitz 40
-
Industar 61
-
-






Sony NEX-5N




CENTER - 100% crops
 
 
f/1.4
f/2.0
f/2.8
f/4.0
f/5.6
f/8
f/11
f/16
Leitz 50
Leitz 40
-
Industar 61
-
-





CORNER (focusing at corner) - 100% crops
 
 
f/1.4
f/2.0
f/2.8
f/4.0
f/5.6
f/8
f/11
f/16
Leitz 50
Leitz 40
-
Industar 61
-
-





CORNER (focusing at center) - 100% crops
 
 
f/1.4
f/2.0
f/2.8
f/4.0
f/5.6
f/8
f/11
f/16
Leitz 50
Leitz 40
-
Industar 61
-
-


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