I have a Contax 645 Carl Zeiss 350mm/F4 Tele Apo-tessar for sale.
It's rarely used, so it's like new.
1. It's super heavy, bulky, large, and not portable at all.
2. It's AF is slow, don't expect to shoot bird-on-fly with this.
3. In dark, it's not even focus right. Not a problem of this special piece, it's common for this lens.
4. Missing the original lens hood, but I have two third party metal hood for it. (I cascade two when use it).
It turns out to be a much better shade/protection than the original hood.
(but not as portable as the original, but hey, it's bad enough even without it, so, what the hack!).
Otherwise, this is a fantastic lens -- what can I say.
If you are interested, please send in your best offer before next Friday.
The best offer above $3600 get it.
You can find the price from KEH as the reference.