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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Auto Tamron 28mm f2.8 (Adaptamatic)
62mm or 58mm
f2.8 - f16
T2i and 6D
This is a somewhat rare lens these days. The adaptamatic mount was abandoned in favor of the adaptall mount. It was in production for only four years. My copy has an M42 mount. It handles well on the T2i. It is very well built. Focus dampening is perfect. The only issue I had was inconsistent exposure in aperture priority mode. Usually the T2i overexposes at f5.6 & up when I use adapters. With this lens the T2i gradually overexposes from 3.5 up.
It is soft at f2.8 with noticeable vignetting. At f4 it tightens up. At f5.6 it is tack sharp.
Contrast is a bit low thru the entire range of f stops. Shadow detail is excellent.
Colors are a bit muted but accurate.
It lacks BBAR coating but it handles fringing and flare well. Use a lens hood at all times to preserve contrast.
Bokeh is not very smooth but it is consistent and not too distracting. Bokeh fringing is very well controlled.
ISO 400 - f2.8 - Vignetting/Distortion
ISO 400 - f4 -
ISO 400 - f4 -100% crop
ISO 800 - f5.6 -100% crop
ISO 400 - f4 -flare
loss of contrast
ISO 400 - f4
ISO 800 - f5.6 - 50% crop
ISO 800 - f3.5
Bokeh Fringing Test
f2.8 - minor shift
f4 - nearly clean
f5.6 - very clean