This is lens is extremely small, it is almost the same size like my Tamron 90mm f/2.8 1:1 Macro (non-Di)
Vivitar 500mm f/8.0 with 1:2.7 close up
next to Tamron 90mm f/2.8 1:1 Macro (non-Di)
A T mount on the back
Close up 1:2.7
A 28mm view of a Towel & Marriott hotel in a distance
in a hazy day
The Marriott is in a far distance, at least 7 blocks
away from the point of shooting
color boosted in post processing
I did this in a hurry
as the plain turns away from me
user fault in the focusing
Impressions & Notes
- I won't recommend fully on this mirror lens from Vivitar.  If your focus is occasional use for tele-shot, by all means, try it but don't have high expectation on this mirror lens, you get what you pay for.
 - The Tele shot in 500mm is reasonable in sharpness but it is all flat in color and contrast.
 - The lens is compact and easy to work with in hand-held operation but I will suggest use of a tripod as the lightweight in this mirror lens hinders the shot stability when I try it.
 - Contrast and color are all flat, one need to tune saturation and contrast on this mirror lens.  I used Vibrant image color tone in K20D and it seems to improve the shot a bit.  Post processing is needed to boost color and contrast.
 - Lens is reasonable in construction but it is too light to get a stabilize shot in both close up and tele settings.
 - Lens can be used in Av mode as all the metering is done wide open with a single aperture.  There is no need to do stop-down metering.
 - The close up in 1:2.7x is a joke only for spec purpose, but in reality, I can't get a single shot with satisfaction.  Please don't rely on this mirror lens for close up as you will be very disappointed.
 
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