LensTip.com

Lens review

Samyang AF 75 mm f/1.8 FE

12 November 2020
Maciej Latałło

5. Chromatic and spherical aberration

Chromatic aberration

Despite a significant number of special elements inside, the Samyang 1.8/75 didn't manage to correct longitudinal chromatic aberration in a perfect way. At the maximum relative aperture you can notice some slight colouring in blurry areas. Fortunately, it is not a huge problem to begin with and it gets marginalized even further when you stop down the aperture by 1 EV.

Samyang AF 75 mm f/1.8 FE - Chromatic and spherical aberration

What about lateral spherical aberration? A graph below presents its performance depending on used aperture for both types of detectors.

Samyang AF 75 mm f/1.8 FE - 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 - - - - - - - - - - - - - - - - -

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


You can notice a disntinct increase of that aberration on stopping down. Near the maximum relative aperture the aberration level is imperceptible but it increases really fast, by f/16 approaching high values.

The Sony 1.8/85 FE also showed an increase of lateral chromatic aberration on stopping down but that process wasn't so fast and the maximum values in its case reached only 0.09%.

A7R II, RAW, f/1.8 A7R II, RAW, f/16.0
Samyang AF 75 mm f/1.8 FE - Chromatic and spherical aberration Samyang AF 75 mm f/1.8 FE - Chromatic and spherical aberration


Spherical aberration

In the first photos of this chapter it would be difficult to notice any focus shift symptoms. We also don't have any reservations concerning the appearance of circles of light reached before and behind the focal point as they are very similar to each other. All these premises make us think the Samyang 1.8/75 doesn't have any problems with spherical aberration correction.

A7R II, f/1.8, before A7R II, f/1.8, after
Samyang AF 75 mm f/1.8 FE - Chromatic and spherical aberration Samyang AF 75 mm f/1.8 FE - Chromatic and spherical aberration