LensTip.com

Lens review

Nikon Nikkor AF 20 mm f/2.8D

22 February 2011
Arkadiusz Olech

7. Coma and astigmatism



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

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

The coma correction level is also not as good as we would wish it to be. At the maximum relative aperture it is noticeable and it doesn’t disappear even on stopping down the aperture to f/4.0.

Nikon Nikkor AF 20 mm f/2.8D - Coma and astigmatism

The situation is much better when it comes to the astigmatism. Here the difference between vertical and horizontal MTF50 values in the frame centre reached just 3.7% which is a result befitting a quite expensive fixed-focal lens.