This lens is a 6 element in 5 group Double-Gauss, the same as my Minolta Hi-Matic 9 that I bought in 1969. That was a lot of lawns. First shot with it- could see on the back of the M9 screen that it rendered like the lens on my Hi-Matic. I'm happy. The salesman at K-Mart convinced me that the Minolta was better than the electronic Yashica GSN with the cool lights and autoexposure, and that I could learn more about setting shutter speeds and F-Stops with the Minolta. After 50 years, the camera looks and works beautifully. I am very happy to have found this rare 5cm F1.8 at a good price. It's a great lens, not produced for long enough. More found in the leaflet-shutter Minolta Super-A than in Leica thread mount. This lens has very different color and rendering than the 5cm F2 Minolta lens, which is a 7 element in 4 group lens - same block diagram as the Summitar. Seems fare- years after the 5cm F1.8 was discontinued, Leica used the 6/5 layout for the V2 Rigid Summicron of the late 60s/early 70s. The V1 Rigid was a 7/5, as is the collapsible Summicron. Have to shoot the fence post up close and tree line of the backyard for calibration. Minolta 5cm F1.8, Wide-Open by fiftyonepointsix, on Flickr Minolta 5cm F1.8, Wide-Open by fiftyonepointsix, on Flickr Wide Open.