Quantaray 500mm f8 Mirror
Most Quantaray lenses were made by Sigma and some were made by Tamron and Tokina. This lens performs like a Sigma Mirror lens. It is reasonably sharp if you can hold it steady. It has the typical ringed bokeh we see from mirror lenses. Contrast is surprisingly high. While it is not a Zeiss or even a Tamron in quality, it is still far better than any of the off-brands flooding the market.
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Minolta MD 50mm f1.7
f1.7 - 16
This was the normal lens for the X-700 and other X series cameras. It has a fair amount of plastic in it. It is lightweight and smaller than Rokkor lenses. Focusing is smooth and positive. Focus throw is 1/2 turn. Aperture clicks at f1.7, f2.8 then 1/2 stops thru f16, then f22. The MD mount is actually an SR mount. It is modified to allow program modes on the X-700.
The lens balances very well on the Eos M3. Focusing is easy enough.
Minolta decided to jump from f1.7 to f2.8 on this lens. At first I didn't see the point, but after shooting a few pics I realized that f2 would have been a silly addition to the aperture ring.
At f1.7 it is sharp but it does show some diffusion as if a soft focus is being used. At f2.8 it is legitimately sharp in the center. Bokeh fringing is very noticeable wide open but disappears completely by f4.
Contrast is excellent w/ good shadow detail.
Color rendition is neutral and saturation is normal
f1.7 - 100% crop - fringing
bokeh fringe - f1.7 - click to view
f1.7 & f2.8
f1.7 - 100% crop
bokeh fringe reduced - f2.8 - click to view
bokeh fringe gone - f4- click to view