Lens review

Leica Apo-Summicron-M 75 mm f/2.0 Asph

8. Vignetting

Wide angle M system lenses have high vignetting. Fortunately, in the case of telephoto lenses, the situation is much better because, although the distance of the sensor from the rear element is still small, it doesn’t force wide angles of light on outermost parts of the frame. In practice, the situation looks like in the pictures of evenly lit surface, which we presented below.

The measurements confirm our visual impressions. At the maximum relative aperture the vignetting is 27% (-0.91 EV) which is a moderate result for full frame. What’s more important, the problem practically disappears on stopping down the aperture to f/2.8 because then the brightness loss in the frame corners decreases to the level of 9%.