At 28mm very light barrel shape. At 50 and 80mm practically no distortion. Barrel has slight play. Only for Dynax xi cameras. At open aperture and stopped down sharp and brilliant.
Edges are less brilliant, also when stopped down.
At 28 and 105mm also after stopping down. Light barrel shape to pillow shape in the extreme distances. Light play in barrel. Only for xi cameras. At 200mm good brilliance with mediocre sharpness.