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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Sigma 28-70mm f2.8 DG
Filter Size:
Lens mount:
Aperture Range:
Close Focus:
Macro Ratio
Year Introduced:
Tested with...
67mm
various
f2.8-f22
..19 meters
n/a
n/a
n/a
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The lens i tested was in Nikon 'D' mount. This was the first version of this DG lens which boasted better multicoating for use with digital cameras. It is a full frame lens.
I found the sharpness from 28mm to 35mm to be very good at all apertures. At 50mm - 70mm the sharpness is excellent from f4 up. At 50mm f5.6, it is quite sharp. Contrast is average at all focal lengths, but soft at 70mm.
Color rendition is neutral.
Fringing is well controlled.
This a pro-sumer lens. It is capable of excellent results. Shadow detail is excellent. This lens will be excellent for portraits with its sweet spot between 50mm-70mm at f4-f5.6. Image quality on a Nikon body should be better than what I can produce on a Canon body with an adapter.

ISO 200 - 28mm - f5.6 - 100%crop

ISO 200 - 70mm - f5.6 - 100%crop

ISO 200 - 35mm - f4

ISO 200 - 70mm - f4

ISO 200 - 70mm - f2.8- 50%crop

ISO 800 - 70mm - f2.8 & f4

ISO 800 - 35mm - f2.8

ISO 800 - 28mm - f2.8 - 50% crop

ISO 800 - 70mm - f2.8 & f4