LensTip.com

Lens review

Samyang 21 mm f/1.4 ED AS UMC CS

8 December 2015
Arkadiusz Olech

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%.


Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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