Uncoated lenses of this type can be nightmares, at best they're handfuls. In the '30s, the uncoated Zeiss 50/f:2 and 50/f:1.5 Sonnars (only four internal surfaces each) were the fast lenses to have for just this reason - I had an f:2 on a Contax II and while it would flare, a decent lens shade and a little care was all it took to make it into a very nice lens, I still sort of miss it. The Plasmat (large format, six internal surfaces, another Rudolph design) is another type which needed coatings to make it a success; one of the reasons the Dagor and Protar types were so popular was a grand total of two internal surfaces.
Originally Posted by Nikanon
The Summitar is seven elements (IIRC), but there are two cemented pairs for ten surfaces, eight internal - a veritable flare-engine when uncoated.
Last edited by E. von Hoegh; 01-07-2014 at 12:01 PM. Click to view previous post history.