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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30mm f3.5-22
40mm f4-22
50mm f2.8-22
60mm f2.8-22
75mm f2.8-22
105mm f4.5-32
135mm f4-32
150mm f3.5-22
180mm f4.5-32
200mm f4.5-32
250mm f5.6-45
500mm f8-64
500mm EII f8-45
45-90mm f4.0-32
100-220mm f4.8-32
32.5mm
62mm
62mm
62mm
62mm
62mm
62mm
62mm
62mm
62mm
62mm
122mm
95mm
95mm
95mm
50mm f4.5-22
65mm f4-22
80mm f3.5-22
100mm f3.5-22
110mm Macro f4-32
150mm f4-22
200mm f4.5-32
250mm f5.6-32
500mm f8-64
95mm
72mm
72mm
72mm
72mm
82mm
82mm
82mm
112mm