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Lens review

Samyang 21 mm f/1.4 ED AS UMC CS

8 December 2015
Szymon Starczewski

7. Coma, astigmatism and bokeh

The coma correction of the tested Samyang 1.4/21 is not bad at all. That aberration is visible both by f/1.4 and by f/2.0 but the deformations are not very pronounced. The results in this category can be described as medium.

X-E1, f/1.4, center X-E1, f/1.4, corner
Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh
X-E1, f/2.0, center X-E1, f/2.0, corner
Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh


A slight decentering of the tested Samyang’s optics had to have some consequences when it comes to the results in the astigmatism category. An average result for the apertures ranging from f/1.4 to f/2.8 reaches a quite significant level of 15%. The lens experiences most problems with that aberration by f/2.0 when it increases to a very high level of 25%.

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When it comes to the light spread, the defocused light circles look sensibly well. You can have some reservations only about the distinct ‘onion ring’ bokeh – such an appearance of the circles in some situations might annoy your aesthetics sense.

X-E1, f/1.4, center X-E1, f/1.4, corner
Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh
X-E1, f/2.0, center X-E1, f/2.0, corner
Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh
X-E1, f/2.8, center X-E1, f/2.8, corner
Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh Samyang 21 mm f/1.4 ED AS UMC CS - Coma, astigmatism and bokeh