Arkadii Shapoval published his review of the new Yongnuo YN 85mm f/1.8 lens for Nikon F-mount (now in stock at aBay, more info can be found here):
Sharpness
- in the center of the frame on the F / 1.8 at the resolution does not shine, but still it is enough for some undemanding fotozadach
- A drop in sharpness to the edges of the frame on the F / 1.8
- edges of the frame sharpness becomes acceptable after F / 4.0
- good / excellent resolution in the center of the frame to cover the apertures after the F / 2.8
Distortion
- the overall level of distortion is at a level typical for such lenses
- the nature of the distortion is unified, easy to fix that in the editor
Vignetting
- the overall level of vignetting is at a level typical for such lenses
- noticeable vignetting is observed only at F / 1.8-F / 2.5
- vignetting increases with focus in the direction of MDF
- vignetting nearly disappear on the values of F / 2.8-F / 4
- vignetting easily fixable in the editor
Aberrations
- open diaphragms have a large number of spherical and chromatic aberration
- better than all the chromatic aberration visible at the edges and corners of the image
- there is a strong frizhing ( HA in the blur zone)
- there is a strong blooming ( HA to strongly contrast fine detail)
