Tokina ATX-M 33 mm f/1.4 X
5. Chromatic and spherical aberration
Chromatic aberration
You don't expect a lot of problems with longitudinal chromatic aberration in a standard lens with as many as 10 elements, one of them made of low dispersion SD glass, that's why photos below were such a surprise. You can notice blue colouring of out-of-focus images behind the focus and red colouring of these before the focus. It's clear the aberration is not corrected in an efficient way. |
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The performance is very untypical, with a distinct minimum by f/2.0 but, fortunately, all values are within a level of 0.06% or less - it means this aberration is low or very low.
| Fujifilm X-T2, RAW, f/1.4 | Fujifilm X-T2, RAW, f/2.0 |
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Spherical aberration
Old Gauss lenses usually had a lot of problems with spherical aberration and in this category the Tokina also invokes these traditions – a pity not the best ones. There is no 'focus shift' effect but defocused circles we got before and behind the focus are distinctly different. You can notice a symptom of spherical aberration that is really classic – a brighter rim of one circle and a darker edge in the other.
| Fujifilm X-T2, f/1.4, before | Fujifilm X-T2, f/1.4, after |
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