the lens corresponds to the supposedly normal focal length of 50mm when full frame. But if I with the right eye open hold through the viewfinder of a Nikon V2 and the left eye, the two images are not the same, but the wide-angle lens appears - that bothers me personally! But this could also be due to the viewfinder of the camera !?
Therefore, a point deduction.
The picture quality is the best you can get in about 1 System for the Nikon. In addition, the lens is compact and fairly easy. Nevertheless, it is made of metal.
Sunny greetings