LensTip.com

Lens review

Nikon Nikkor Z 40 mm f/2.0

26 November 2021
Maciej Latałło

7. Coma, astigmatism and bokeh

If you want to avoid coma while working with the Nikkor Z 40 mm f/2, stick to the APS-C/DX sensor. In the corners of full frame off-axis aberrations influencing point-like images of a diode are really significant. Fortunately, on stopping down the aperture by 1 EV the problem decreases; still it is not elliminated completely.

Center, f/2.0 Corner APS-C, f/2.0 Corner FF, f/2.0
Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh
Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh


Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 5.9%, a value that can be described as low. In this area the Nikkor fares a bit better than in the case of coma.


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

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

Aspherical elements, present in the optical construction of the Nikkor Z 2/40, make themselves felt a bit so the light spread in defocused circles is not perfectly smooth. Still, it would be difficult to spot any distinct extreme points and you have to look very closely to notice onion-ring bokeh structure at all. A brighter rim is a bit pronounced but you don't have any serious problems with mechanical vignetting for a change.

Center, f/2.0 Corner APS-C, f/2.0 Corner FF, f/2.0
Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh
Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh
Center, f/4.0 Corner APS-C, f/4.0 Corner FF, f/4.0
Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh Nikon Nikkor Z 40 mm f/2.0 - Coma, astigmatism and bokeh