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Title: Puzzled about puzzled owners
Review: The cheapie 500 mm Maksutov/cassegrain lenses have been around for decades made by various optical companies. Mostly, they're not very good; mine has been buried in my "useless gadgets" bin for years. I doubt this one is any better.But I am puzzled that the owners of D50 and D70 cameras would expect to be able to adjust the aperture of such a lens. THERE IS NO APERTURE DIAPHRAGM on a mirror lens. It is always wide open. There's little point to complaining about something that is inherent in the lens type; if you can't accept it, don't buy it. I'm surprised that the owners didn't complain that their meters didn't work, since the lens is not advertised as an autofocus unit.
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