Quote Originally Posted by Dan Fromm View Post
vpwphoto, get the catalogs and study them. You'll learn that in the Soviet scheme of things, names like Helios, Industar, Jupiter, Russar, ... identified (usually) a design type and were applied to lenses with a wide range of focal lengths and coverages.
I have, just didn't realize he was talking LF, the Industar-51 I am most familiar with is the LTM series.
Live and learn.