SainSonic Kamlan 50 mm f/1.1
5. Chromatic and spherical aberration
Chromatic aberration
Longitudinal chromatic aberration makes itself felt a bit but, taking the very fast aperture of the lens and its simple optical construction without any low dispersion elements into account the final result is not bad at all. I admit it is a very pleasant surprise. |
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Near the maximum relative aperture the level of that aberration can be described as medium. Fortunately from f/2.8 upwards it decreases to low values and it’s a constant trend. Once again we can say that, despite its simple construction, the Kamlan 1.1/50 fares in this category sensibly well.
| Fujifilm X-T2, RAW, f/1.1 | Fujifilm X-T2, RAW, f/8.0 |
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Spherical aberration
We can have a lot of reservations concerning the correction of spherical aberration. The first photos of this chapter show focus shift – after stopping down the lens from f/1.1 to f/2.0 the depth moves a bit toward greater distances. What’s more, defocused circles of light we got before and after the focal point differ and their differences are characteristic for spherical aberration not corrected as well as it should be. The ‘mist’ visible in f/1.1 photos also proves the noticeable influence of spherical aberration.
| X-T2, f/1.1, in front of | X-T2, f/1.1, behind |
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