Samyang AF 24 mm f/2.8 FE review - Coma, astigmatism and bokeh

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Samyang AF 24 mm f/2.8 FE

11 September 2018

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Samyang 2.8/24 FE corrects coma in a quite interesting way. When you move away from the centre that aberration increases swiftly so at the maximum relative aperture, in the corner of the APS-C sensor, the image of a diode is already noticeably deformed. Then the increase of coma stops and even decreases very slightly so in the very corner of the frame you get a quite good image for a change.

Center, f/2.8	Corner APS-C, f/2.8	Corner FF, f/2.8

Center, f/4.0	Corner APS-C, f/4.0	Corner FF, f/4.0

The astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 11.6% which is a medium level.

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The appearance of out-of-focus images is simply weak. First, you see a lot of concentric but rather ragged circles which shapes are most likely connected to the presence of three aspherical elements. Additionally you can notice that seven diaphragm blades don’t provide a fully round aperture and on stopping down the image of the “circle” is hardly symmetric. The presence of huge mechanical vignetting in such a small lens cannot be called a surprise, though.

Center, f/2.8	Corner APS-C, f/2.8	Corner FF, f/2.8

Center, f/4.0	Corner APS-C, f/4.0	Corner FF, f/4.0

Center, f/5.6	Corner APS-C, f/5.6	Corner FF, f/5.6