O-N-F, you mentioned the Agfa Repromaster lens a few posts ago. I had one a couple of years ago, a 305mm I think, that I used on a camera. It was a sharp lens, big and heavy as well. They are cheap (I think I paid $60) with a large image circle so maybe take a look at that one. I seem to recall that it is a six element design. I am working off of memory though so don't quote me...