Mitakon Speedmaster 50 mm f/0.95 review - Vignetting

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Mitakon Speedmaster 50 mm f/0.95

22 December 2017

Arkadiusz Olech

8. Vignetting

First let’s assess the vignetting performance on the smaller APS-C sensor – appropriate thumbnails you can find below.

A7R II, APS-C, f/0.95	A7R II, APS-C, f/1.4

In this case you notice moderate brightness loss only at the maximum relative aperture where it reaches 26% (−0.86 EV). After employing f/1.4 and f/2.0 the problem disappears completely as the vignetting level drops to 9% (−0.28 EV) and 4% (−0.11 EV) respectively.

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When you join the lens with the bigger full frame sensor there are much more problems as shown in photos below.

A7R II, FF, f/0.95	A7R II, FF, f/1.4

A7R II, FF, f/2.0	A7R II, FF, f/2.8

At the maximum relative aperture you can lose as much as 64% (−2.98 EV) in the very corners of the frame. By f/1.4 the situation is not better, with the vignetting level amounting to 48% (−1.91 EV). By f/2.0 that aberration still remains noticeable, with a result of 28% (−0.95 EV). The problem is becoming marginal by f/2.8 and f/4.0 where it is, respectively, 15% (−0.47 EV) and 11% (−0.33 EV). Further stopping down doesn’t have any measurable influence over vignetting.

Sony A7R II, JPEG, f/0.95