Samyang 8 mm f/2.8 UMC Fisheye review - Coma and astigmatism

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Samyang 8 mm f/2.8 UMC Fisheye

4 September 2012

Arkadiusz Olech

7. Coma and astigmatism

Coma is perhaps not corrected in a perfect way but certainly you can’t call its level high. It can be seen very clearly in the crops below. At the maximum relative aperture it remains medium and it decreases significantly on stopping down by one EV.

Samyang 8 mm f/2.8 UMC Fisheye - Coma and astigmatism

The astigmatism is corrected in a great way for a change. An average difference between horizontal and vertical MTF50 values amounted to Just 1.3% which is simply an excellent result.

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For a lens with such parameters the depth of field is so large that it would be difficult to talk about any distinct fuzzy areas. It is also difficult to get circles of defocused points of light big enough (especially that in the frame corners it would be hard to talk about circles at all) so we won’t bring up that issue here at all.