Samyang 35 mm f/1.4 AS UMC review - Coma and astigmatism

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Samyang 35 mm f/1.4 AS UMC

30 March 2011

Arkadiusz Olech

7. Coma and astigmatism

The coma is visible, although not very distinct, already in the corner of the smaller sensor. It becomes pronounced in the full frame corner. Its level is perhaps not record high but it hardly reacts to stopping down which is an unpleasant property. Photos taken by f/1.4 and f/2.0 don’t differ significantly.

It’s worth emphasizing that the coma level, presented here, is still much lower than that of the Nikkor 1.4/35 or the Canon 35L. In the case of the latter the coma was very bothersome even on the APS-C sensor.

Samyang 35 mm f/1.4 AS UMC - Coma and astigmatism

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When it comes to the Samyang 1.4/35 the astigmatism is not a problem. The average difference between horizontal and vertical MTF50 function values amounted to just 2.5% which is a splendid result.