>>2962117About as good as a catadioptric can get at 500mm.
i saw an article comparing a bunch of 500mm's once, and iirc the writer was hard for a leica or zeiss cat.... i forget... but from memory I think the one lens he didnt compare.. the ZM-6A... i was thinking was as good or better than his pick. I have a feeling his objectivity was tainted by the brand thing too.
I really need to make oh-hi searchable by lens.
Start here. Scroll down. Most will be one of the cats or another....Click images to see exif. Compare focallenght and aperture to the lenses in the list i posted above... fixed aperture is nice like that as an ID.
http://oh-hi.info/2013_1-4/?from=2013-04-25.jpg 