LensTip.com

Lens review

Pentax smc FA 35 mm f/2 AL

20 July 2010
Arkadiusz Olech

7. Coma and astigmatism

Looking at the coma results the Pentax competitors achieved we can notice that every instrument fared differently. The Nikkor didn’t exactly distinguish itself, showing huge coma wide open; it remained high even after stopping down by one stop. The Canon fared the other way round as it had acceptable coma at the maximum aperture, lower than that of the Nikkor after stopping down.

Pentax can be placed somewhere in between. Its coma is a bit higher than that of the Canon but significantly lower than the Nikkor’s. The fact that by f/2.8 this aberration decreases a lot is also important.

Pentax smc FA 35 mm f/2 AL - 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 Pentax 2/35 corrects the astigmatism equally well. The average distance between vertical and horizontal MTF50 values amounted to 4.8% which is a very good result. It’s true that the Nikkor had only 3% here but the Canon fared definitely worse for a change, with the result reaching as much as 17%.