Dear Bob,
First of all, I think you are confusing TWO Quantaray lenses. They have
a 500mm f/8 mirror lens (t-mount) at $199 and a 500mm f8 lenses that comes
with the 2x extender (also a thread mount) for $129. The latter is NOT a
mirror lens.
Are they worth it? Depends :). The second lenses mentioned (we'll call it
the 1000mmm, they do) is very dark and poor lens quality. I'd stay away
from it. The 500mm mirror is, well, a $200 500mm mirror :) It will do what
you'd expect from a lense that size and price. One thing to keep in mind
is it has a VERY short depth of field. Definition of very short? If you
were
taking a picture of a deer, you wouldn't get the whole animal in focus.
IMHO, neither are worth it. I used to work for Ritz and could have
gotten
these at a discount. I decided to pass.
enjoy,
Brad
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