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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Petri 28mm f2
Filter Size:
Lens mount:
Aperture Range:
Close Focus:
Macro Ratio
Year Introduced:
Tested with...
49mm
Pentax K
f2-f16
.3 meters
n/a
n/a
Eos M3

For starters, this lens is a Cosinon. Cosina has made some good 28mm's for Vivitar and here they've made a good lens for Petri.
I'll get right to it. This lens is reasonably sharp at f2. Contrast is excellent wide open. It is not soft.
Chroma is very well controlled. Fringing is well controlled. Flare is also well controlled. Shooting directly into the sun will cause a loss of contrast and a few heaxagonal spots but flare is non existent with the sun just out of frame. Harsh lighting results in some highlight clipping.
On the subframe Eos M3 there is little distortion.
Color rendition is excellent.
Bokeh is smooth and bokeh fringing is barely noticeable in real life shooting. However, in close focus shooting it can be seen up to f2.8.
It focuses down to 8" and is well dampened.
On the M3 it makes a good walk around lens. Focusing is easy through the viewfinder and it balances perfectly in the hand.

ISO 800 - f5.6

ISO 100 - f4

ISO 800 - f4

ISO 400 - f2 - 100% crop

ISO 100 - f8

ISO 1600 - f2
minimal bokeh fringing

ISO 1600 - f2.8 - 100% crop

ISO 100 - f2.8

ISO 400 - f2

ISO 1600 - f2

ISO 1600 - f2

ISO 800 - f2.8

ISO 100 - f2

ISO 100 - f2.8

bokeh fringe - f2

bokeh fringe - f2.8

bokeh fringe - f4 - edge

bokeh fringe - f5.6 - edge