LensTip.com

Lens review

Nikon Nikkor AF-S 20 mm f/1.8G ED

18 October 2014
Arkadiusz Olech

7. Coma, astigmatism and bokeh

As long as you work on an APS-C/DX sensor the coma won’t be problematic at all. The situation changes completely in the corners of full frame where the coma level is high and it contributes greatly to the deterioration of the image quality. What’s more, even on stopping down by 1 EV its level remains significant.

Nikon Nikkor AF-S 20 mm f/1.8G ED - Coma, astigmatism and bokeh


The tested lens doesn’t have any problems with the astigmatism correction for a change. An average difference between horizontal and vertical MTF50 function values amounted to just 3.2% and we consider it low.


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

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

It would be also difficult to carp about defocused images seriously. The light circles do have the onion rings structure but that effect is not especially pronounced and you can’t see any distinct local extremes or rims. You also should remember that, with such parameters, you won’t have a lot of opportunities to admire vast blurred areas in your photos.

Nikon Nikkor AF-S 20 mm f/1.8G ED - Coma, astigmatism and bokeh