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Lens review

Leica Summicron-M 28 mm f/2.0 Asph

29 March 2010
Szymon Starczewski

4. Image resolution

Image resolution, understood as MTF50 function values, was measured on the strength of TIFF files which were converted from a Leica M9 RAW files without sharpening by the dcraw program. The results are presented on the graph below.

Leica Summicron-M 28 mm f/2.0 Asph - Image resolution

It would be hard to compare the obtained results with those of any other lenses – so far we have tested only the Summicron 2/50 on the M9 body. It is worth remembering, though, that in the frame centre it got almost 38 lpmm when wide open and the maximum of its possibilities it reached at the level just above 51 lpmm by f/5.6

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The Summicron 2/28 performs a bit differently. At the maximum aperture it gets almost 33 lpmm – you can say a result barely decent when we take into account the price of the lens. Fortunately on stopping down the lens spreads its wings in an impressive way. By f/2.8 we already note the value of 44 lpmm, by f/4.0 we exceed 50 lpmm and by f/5.6 we reach 53 lpmm. Such a result is really sensational.

Taking into account the lens’s parameters and physical dimensions the Summicron’s 2/28 performance at the edge of full frame should be assessed very positively. You can have some reservations at the maximum relative aperture where we don’t reach the level of 30 lpmm. On stopping down the MTFs improve very quickly, though and in the f/4-8 aperture range are at the level of 40 lpmm. The Summicron 2/28 fares a lot better at the frame edge than the Summicron 2/50 and, after all, the difference between the reached angles of view is immense. We can say that with such a performance the Summicron 2/28 becomes really worth its price.


Leica Summicron-M 28 mm f/2.0 Asph - Image resolution