Weren't they matched to the 75 mm lens rather than the 80 mm? That doesn't mean that they won't work with the 80, just that their performance and coverage might not be as good.
Tele-converters that go in front of the lens have the advantage of not affecting the aperture (ie f/5.6 stays f/5.6, unlike a behind-the-lens converter). This is offset by the requirement to stop down for decent performance - the performance at f/2.8 and f/4 may be poor.
I wonder if a Mamiya with interchangeable lenses might not be a better option than a pair of Mutars if you really want different focal lengths.
An aside: though Rollei managed to turn out the 4.0 FW (the new version of the wide) it looks like the promised new version of the tele will not go into production. Potential sales expected to suffer because of the same old drawback that the original had: poor minimum focussing distance? The two Tele-Rolleinars get round that, but with some inconvenience.
Last edited by Helen B; 01-28-2005 at 06:47 PM. Click to view previous post history.