Lens review

Leica D Summilux 25 mm f/1.4

7. Coma and astigmatism

It is obvious that the next reason of the weak frame edge performance is coma, which, at maximum relative aperture, is very visible indeed. Fortunately when you stop down to f/2.0 it decreases to a minimum level. Here again the Leica fares worse than the Olympus primes but very similarly to the Canon 1.4/35.

The astigmatism level is average because the typical differences between horizontal and vertical MTF50 function values reached 11% in our test.