The 85 has usually been a few dollars more than the 100 / 105, and not as common.
Even the 105 has had a general rise in popularity: for most shooters the 135 was more common 30 years ago.
The classic 'blueprint' for an 85 was the Sonnar made for the Contax rfdr in the '30s. The uncoated lens, almost 70 years old, is still formidable. It's spiritual descendants grew in two directions: f/2 lenses, and FASTER !
My favorites in the f/2 class ( for SLRs ) are the Nikkor MF 85/1.8s in all their variety, the current Canon EF 85/1.8, and the Jupiter 8. Any one of which is a bargain, and a wonderful performer. The Jupiter comes as a pre-set M42 mt., and is as close to being free as is possible. And any generation 90 Summicron is a lovely lens.
In the fast f/1.5 - f/1.4 class, it's pretty safe to say any early 1950's f/1.5 ( like Leica's Summarex or the Nikon f/1.5 ) are pretty inferior by objective and strict lab standards. In other words, they have immense potential if you shoot faces. At f/1.5 the Summarex is soft, but not grotesque; by f/4 they are show detail at a good contrast. The Nikon is a bit better, being a postwar design. They are both rfdr lenses, both highly collectable, and a little extreme for normal taste. Love 'em.... or hate 'em !
For SLR 85 f/1.4, it seems every one ever made is superb. EVERYBODY made one ( OK, Canon is f1.2 ) and they are all ... great. But they are all relatively new lenses.
As a tool, all 85s have a special look, neither normal nor long. Get one and see, and live in a much better world than some interrmediate setting between 80 and 200 on a zoom.
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