LensTip.com

Lens review

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

18 October 2014
Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

Fast Nikkors rarely correct the longitudinal chromatic aberration well. The crops below show the results of the Nikkor 1.8/20.

Nikon Nikkor AF-S 20 mm f/1.8G ED - Chromatic and spherical aberration


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 should be clearly stated: those results look sensible. At the maximum relative aperture you see slight cast of images registered behind the focal point but that effect is not distinct. What’s important, it decreases significantly on stopping down the aperture.

Let’s check the lateral chromatic aberration performance now – the graph below shows the connection between it and the aperture values.

Nikon Nikkor AF-S 20 mm f/1.8G ED - Chromatic and spherical aberration


Here the lens should definitely be praised. Correcting that aberration while you feature such a wide angle of view and such a fast aperture is certainly difficult but the Nikkor managed it splendidly. No matter what detector and what aperture you apply, the lateral aberration keeps near a very low level of 0.06-0.07%. A round of applause!

Nikon Nikkor AF-S 20 mm f/1.8G ED - Chromatic and spherical aberration



Spherical aberration

The lens didn’t show any „focus shift” effect. What’s more, the defocused circles of light we got in front of and behind the focus didn’t differ distinctly. Both these facts prove that the spherical aberration is corrected properly by the tested lens.

Nikon Nikkor AF-S 20 mm f/1.8G ED - Chromatic and spherical aberration