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For anyone looking at buying the cheap chinese catadioptrics: I can't comment directly as I don't own any, but they seem fairly shit in general.
Photos iv'e seen from people who do own them they are the sameIQ as my sigma 600mm/8 - not great - in fact the 'bower' type lenses seem to be exactly the same design.
I'd recommend:
ZM-6A 500mm/6.3 or the Tamron 500mm/8 (55BB)
MTO 11-CA 1000mm/10
depending on the focal length you want.
image - reflector separation on edge of front mirror. Very fucking tiny little squiggles. Causes flare on APS-C, and generally makes it not worth using even though the damaged part is almost entirely outside the image frame. VERY common in old sigma cats. Iv'e never seen this in a russian or tamron.
