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Testing my lenses
with the One Dollar Resolution Chart (a7s vs 5N)


 
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The One Dollar Resolution Chart


In this case I will compare my lens sharpness results with the a7s and the NEX-5N with Metabones SpeedBooster.

The SpeedBooster is a focal reducer: it multiplies the focal length and aperture of the lens by 0.71x. Since the 5N sensor is APS-C, you then have to multiply the result by 1.52x to get the FF-equivalent focal length and aperture (explanation here) (I know these terms are, strictly speaking, wrong; but they are useful, so, there). The 5N has more megapixels, but the a7s is full frame, and I have always defended that full frame is sharper (tests here). So, let's see how this goes...

The lenses I have tested are the following:
* Leitz Elmarit-R 24mm f/2.8 (1978) (Leica R)
* Leitz Elmarit-R 35mm f/2.8 (1978) (Leica R)
* Leitz Summilux-R 50mm f/1.4 (1976) (Leica R)
* Leitz Elmarit-R 90mm f/2.8 (1966) (Leica R)





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CENTER - 100% crops (4k/4.9k)
 
 
f/1.4
f/2.8
f/5.6
24mm on a7s
-
24mm on 5N+SB
-
35mm on a7s
-
35mm on 5N+SB
-
50mm on a7s
50mm on 5N+SB
90mm on a7s
-
90mm on 5N+SB
-





CORNER - 100% crops (4k/4.9k)
 
 
f/1.4
f/2.8
f/5.6
24mm on a7s
-
24mm on 5N+SB
-
35mm on a7s
-
35mm on 5N+SB
-
50mm on a7s
50mm on 5N+SB
90mm on a7s
-
90mm on 5N+SB
-





CENTER - crops downsized to 1080p
 
 
f/1.4
f/2.8
f/5.6
24mm on a7s
-
24mm on 5N+SB
-
35mm on a7s
-
35mm on 5N+SB
-
50mm on a7s
50mm on 5N+SB
90mm on a7s
-
90mm on 5N+SB
-





CORNER - crops downsized to 1080p
 
 
f/1.4
f/2.8
f/5.6
24mm on a7s
-
24mm on 5N+SB
-
35mm on a7s
-
35mm on 5N+SB
-
50mm on a7s
50mm on 5N+SB
90mm on a7s
-
90mm on 5N+SB
-


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