Nikon Nikkor Z 14-30 mm f/4 S
7. Coma, astigmatism and bokeh
Center, 14 mm, f/4.0 | Corner APS-C, 14 mm, f/4.0 | Corner FF, 14 mm, f/4.0 |
![]() |
![]() |
![]() |
Center, 22 mm, f/4.0 | Corner APS-C, 22 mm, f/4.0 | Corner FF, 22 mm, f/4.0 |
![]() |
![]() |
![]() |
Center, 30 mm, f/4.0 | Corner APS-C, 30 mm, f/4.0 | Corner FF, 30 mm, f/4.0 |
![]() |
![]() |
![]() |
Similar situation can be observed when you take photos of a starry sky - one example of such a phenomenon we show below.
Please Support UsThe 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. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Nikon Z6, 14 mm, f/4.0, prawy-górny Corner 1:1 |
![]() |
Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 19.3% and it is a significant value. Still most of problems, connected to this aberration, you can experience at the maximum focal length where astigmatism level reaches 24.5% which is pretty high.
Defocused circles of light aren't perfect but it would be foolish to expect it from a lens with such parameters. After all its optical construction features as many as four aspherical elements – their presence is visible in the appearance of the circles as a slight onion-ring bokeh effect. What's interesting, at the maximum focal length the lens doesn't have any problems with mechanical vignetting as it appears only at the maximum relative aperture.
Center, 30 mm, f/4.0 | Corner APS-C, 30 mm, f/4.0 | Corner FF, 30 mm, f/4.0 |
![]() |
![]() |
![]() |
Center, 30 mm, f/5.6 | Corner APS-C, 30 mm, f/5.6 | Corner FF, 30 mm, f/5.6 |
![]() |
![]() |
![]() |
Center, 30 mm, f/8.0 | Corner APS-C, 30 mm, f/8.0 | Corner FF, 30 mm, f/8.0 |
![]() |
![]() |
![]() |