LensTip.com

Lens review

Tokina AT-X 116 PRO DX AF 11-16 mm f/2.8

25 May 2009
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 crops presented below show how a diode’s circular image changes as we move from the frame’s center to the corners. As we can see, coma can really get in one’s hair. For each and every focal length, the diode’s image is clearly deformed, which can’t fail to influence the corner image quality.

Tokina AT-X 116 PRO DX AF 11-16 mm f/2.8 - Coma and astigmatism


When it comes to another off-axis aberration – astigmatism, the situation is better. The average difference between horizontal and vertical values of the MTF50 function equals 7%, which is a good result.