I've recently taken the leap and bought the CFV 50c back for my V system. I'm very happy with it, but it exposed a few inadequacies in my lens collection. And it instilled a desire to go for much longer focal lengths for landscape and portraiture.
The old 250mm synchro sonnar definitely is no longer up to the job. Ideally, I'd like to have a lens in a similar focal length to that, plus one that is very long. The 350mm superachromat lens is surprisingly expensive, hard to find one under $10k, while the tele-apotessar 500mm seems more reasonably priced.
Does anyone own either of those two lenses, or both, and has an opinion and perhaps some sample images on their relative performance?
I also have the Zeiss Mutar 2x which works beautifully, so the ability to get to 1000mm focal length is very tempting. But 700mm would be good enough as well, what really counts for me is image sharpness and contrast.
Is the superachromat really 10 times better?