I signed up on the Yahoogroups Kiron group to get some info on a very obscure custom one, but that was probably a dumb assumption they would be familiar.

If you didn't get the lens, I'd sign up on that user group if you have piqued a particular interest in finding a Kiron lens, because they can tell you and endorse for you specific lenses, as well as tell you which Vivitar ones were made by Kino and which by others. There's a pretty strong knowledge base in that group.

The guy who did the advertising campaign for the Kiron line is (has been in the past, anyway) even in the mix on occasion.