> I will try shooting some swans again with the M 200mm F4 tele mounted on > the A2x-s converter to compare it with the A70-210mm zoom. This would be > nice solution too and I wonder if the M 200mm tele will be any better > especially in the edges than the zoom.
Of course, for shooting swans, edge and corner sharpness are not of the highest concern. (For example, I think that that was part of the design in the Novoflex 400/5.6 and 600/8 "gunstock lenses", used a lot for wildlife - they were razor sharp in the center, and not so sharp in the corners.) I suspect that the 200mm prime would probably do better on the TC than the "-210" zoom - that would be the "usual, accepted" assumption. However, there are some particular lens-TC combinations that can be surprising - sometimes a particular combination can be a lot better or a lot worse than expected. Fred
