Canon EF-S 35 mm f/2.8 Macro IS STM review - Coma, astigmatism and bokeh

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Canon EF-S 35 mm f/2.8 Macro IS STM

25 September 2017

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The crops presented below, taken from photos of a diode which was positioned in the frame centre and in its corner, show that the tested lens doesn’t have the slightest problems with coma correction and deserves to be praised. The results of the Nikkor AF-S DX Micro 40 mm f/2.8G were very similar but the Tokina AT-X M35 PRO DX 35 mm f/2.8 had a bit more issues in this area.

50D, f/2.8, center	50D, f/2.8, corner

50D, f/4.0, center	50D, f/4.0, corner

When it comes to the astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, its level can be called imperceptible. We got just 2% and it’s a result noticeably lower than 11% of the Nikkor 2.8/40 and, within the margin of error, the same as 3% reached by the Tokina.

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Defocused light circles are hardly perfect. A lighter rim and concentric rings stick out a bit, most likely because the lens features an aspherical element in its construction. By f/2.8 the mechanical vignetting makes itself felt but it diminishes noticeably on stopping down the aperture to f/4.0.