Summary: I don't like very much the use of external finder and this one is not as good as this for the 21mm. The bright lines are too chick. The quality of the construction is beautiful and the pictures are great. For me, this lens is too big and too heavy for a rangefinder body but the effect are very interesting.
Contax 18mm f/4 Carl Zeiss T* Distagon on a canon EOS
25 October 2006
Summary: This lens is the best 18mm you can get for your Canon EOS full frame cameras. With proper adapter the lens is very sharp in the center and sharp on the corners. Blows Canons wideangle lenses out of the water.
Summary: It is a classic lens with at least 30 years history without change the lens formula. However, it produces very good image. Medium distortion but with very high color saturation. Good center resolution but with soft edge. However it is still top performance within this lens group. I rate this lens as good since there is no filter threat and the lens need a special filter adapter and usin 86mm size filter.