Samyang AF 75 mm f/1.8 FE
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. |
Please Support UsIf you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio; only that way we will be able to continue providing you interesting content for free. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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 |
|
|
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 |
|
|
