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Lens review

SainSonic Kamlan 50 mm f/1.1

15 October 2018
Maciej Latałło

8. Vignetting

Let’s have a look at thumbnails presented below in order to assess the vignetting performance of the tested lens. These thumbnails were taken from JPEG files produced by the Fujifilm X-T2.

Fujifilm X-T2, f/1.1 Fujifilm X-T2, f/2.0
SainSonic Kamlan 50 mm f/1.1 - Vignetting SainSonic Kamlan 50 mm f/1.1 - Vignetting
Fujifilm X-T2, f/2.8 Fujifilm X-T2, f/4.0
SainSonic Kamlan 50 mm f/1.1 - Vignetting SainSonic Kamlan 50 mm f/1.1 - Vignetting


Small physical dimensions of the Kamlan make themselves felt very keenly here. At the maximum relative aperture brightness loss in the frame corners amounts to as much as 49% (−1.96 EV) – a high value when it comes to a lens designed for a sensor smaller than full frame. On applying f/2.0 the vignetting decreases to 42% (−1.56 EV) and it is still a very high value. Even by f/2.8 and f/4.0 you can notice effects of light fall-off without any problems as by those apertures the lens reaches the same value of 33% (−1.15 EV). Further stopping down has very little influence on that aberration and by f/5.6 and f/8.0 the vignetting is, respectively, 32% (−1.12 EV) and −30% (−1.01 EV).

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A very similar performance can be observed for RAW files.

Fujifilm X-T2, JPEG, f/1.1
SainSonic Kamlan 50 mm f/1.1 - Vignetting