Yongnuo YN 35 mm f/2.0 review - Vignetting

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Yongnuo YN 35 mm f/2.0

17 June 2015

Arkadiusz Olech

8. Vignetting

First let’s check how the Yongnuo 2/35 manages in this category on a small sensor o f the Canon 50D. Appropriate thumbnails are presented below.

Canon 50D, f/2.0	Canon 50D, f/2.8

You get a chance to notice the vignetting only at the maximum relative aperture where it reaches 18% (−0.58 EV). Already by f/2.8 the problem disappears almost completely as the value measured by us amounted to just 7% (−0.21 EV).

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Now let’s see how the situation changes after passing to full frame.

Canon 5D III, f/2.0	Canon 5D III, f/2.8

Canon 5D III, f/4.0	Canon 5D III, f/5.6

Here the problems are already very serious. At the maximum relative aperture the brightness loss in the corners of the frame reaches as high as 52% (−2.14 EV). It is quite a lot but, after all, even the result of the more expensive and bigger Canon EF 35 mm f/2.0 USM IS was much worse - over 3 EV! By f/2.8 the vignetting decreases to 30% (−1.03 EV), and by f/4.0 it becomes slight, getting to just 18% (−0.58 EV). The aberration becomes almost imperceptible by f/5.6 and f/8.0 apertures, where it is respectively 12% (−0.37 EV) and 11% (−0.35 EV).