Samyang AF 35 mm f/2.8 FE review - Vignetting

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Samyang AF 35 mm f/2.8 FE

6 December 2017

Arkadiusz Olech

8. Vignetting

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

A7R II, APS-C, f/2.8	A7R II, APS-C, f/4.0

At this place, nothing to worry. The vignetting is noticeable at the maximum relative aperture, reaching 29% (-0.98 EV) but already by f/4.0 and f/5.6 the problems become less pronounced, with the following results: 17% (-0.52 EV) and 13% (-0.41 EV) respectively.

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Now let’s see how the tested lens fares on full frame by consulting thumbnails shown below.

A7R II, FF, f/2.8	A7R II, FF, f/4.0

A7R II, FF, f/5.6	A7R II, FF, f/8.0

In this case you can say the problems are really serious. At the maximum relative aperture you lose as much as 63% of light (-2.91 EV). It is a bit more than in the case of the Sonnar which vignetting amounted to 58%. By f/4.0 that aberration still remains distinct, reaching 49% (-1.97 EV), and by f/5.6 it is 42% (-1.59 EV) - by these apertures the Samyang performs better than the Sonnar. On further stopping down the situation doesn’t improve, though. By f/8.0 the brightness loss gets to 37% (−1.32 EV), and by f/11 it is 33% (−1.16 EV). You can still glimpse some vignetting even by f/16, where it reaches 30% (-1.01 EV).

Below we present averaged out values of brightness loss shown in concentric circles as you move further away from the frame centre. The numerical value for every image, expressed in percents, shows the area limited from the top and right by 100% and from the bottom by the presented curve. The area indicates how much light overall is lost due to the vignetting effect. Please don’t mix these percentages with the values given at the beginning of the chapter because they aren’t directly connected.

Samyang AF 35 mm f/2.8 FE - Vignetting