At 2.0 the EF 50 was very good. At 8 both EF 50 and Ricoh was excellent with the zoom almost as good. The vignetting was high at 1.0, mucher better at 1.4 and almost gone at 2.0. Sharpness was very good wide open but improves of course when stopping down. Corners were a bit softer at all apertures but very good at 5.6.
Normal pictures look great, even wide open.
The back side of the lens with the contacts. The vignetting at full aperture. Vignetting looks bad because of contrast enhancement in Photoshop. Larger image Test at different apertures. Vignetting looks bad because of contrast enhancement in Photoshop.