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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Mamiya Sekor 50mm f2
The auto Mamiya Sekor 50mm f2 is a 70's lens with an m42 mount. Like most 50mm's of that era, it is well made. Focus dampening is excellent. Optics are excellent from f3.5 up. At f2 and f2.8 it is a bit soft. Color rendition is neutral and accurate. Bokeh is smooth. Shadow detail is excellent. Contrast is consistent at all apertures. Flare is present if you point it directly into the sun. Images from this lens have nice depth which is reminiscent of a Mamiya TLR's image rendition.
