Samyang 24 mm f/1.4 ED AS UMC review - Coma, astigmatism and bokeh

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Samyang 24 mm f/1.4 ED AS UMC

10 February 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The coma is corrected well in the corner of the APS-C/DX sensor. On full frame, though, you can see it clearly although its level can hardly be called monstrous or very high. What’s interesting, the coma doesn’t change almost at all when you pass from f/1.4 to f/2.0.

Samyang 24 mm f/1.4 ED AS UMC - Coma, astigmatism and bokeh

The astigmatism contributes noticeably to the worsening of the image quality. An average difference between horizontal and vertical MTF50 function values amounts to 12% which is a medium result.

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Let’s find out how the tested lens renders out-of-focus areas. A defocused image of a point-like diode looks nice. There are no very light or very dark circles or pronounced diversities. It is still far from perfect but the result should be assessed positively. The fact that the image by f/1.4 and by f/2.0 is practically identical in the corner of full frame is a curiosity.