Tokina Fírin 20 mm f/2 FE MF review - Chromatic and spherical aberration

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Tokina Fírin 20 mm f/2 FE MF

16 November 2017

Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

The Fírin 20 mm f/2 doesn’t have any problems related to the longitudinal chromatic aberration. The photos below show clearly that the colouring of out-of-focus images is very slight already at the maximum relative aperture.

Tokina Fírin 20 mm f/2 FE MF - Chromatic and spherical aberration

Good aperture fastness and an angle of view of 100 degrees are very demanding when it comes to the correction of lateral chromatic aberration. How the Tokina optics specialists managed that task? Let’s have a look at a graph below.

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The aberration level is the highest near the maximum relative aperture but even there it would be hard to speak about any problems. What’s more, the values decrease very swiftly on stopping down. The overall assessment in this category must be very good.

A7R II, RAW, f/2.0	A7R II, RAW, f/16.0

Spherical aberration

First photos of this chapter don’t feature any ‘focus shift’ effect. Additionally, when you consult defocused circles of light we created in front of and behind the focus, you won’t notice anything disturbing either. These facts and the high resolution level by f/2.0 allow us to say that the Tokina 2/20 doesn’t have any noticeable problems with spherical aberration.