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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Yashinon DS 28mm f2.8
Yashica made 3 lines of lenses for m42 mount. DX, DS and DS-M. DX lenses were single coated and not tack sharp but had a nice smooth bokeh. DS lenses were multicoated, sharp and offered a soft bokeh. DS-M lenses were tack sharp but the bokeh was a little harsh. I prefer the DS line.
The DS 28mm 2.8 is sharper than a Yashica 28mm f2.8 ML and has better bokeh.
I regrettably sold my first copy of this lens but I was able to acquire another one. It handles well on the Eos 6D. Focus dampening is very smooth. Focus throw is 1/2 turn. Aperture clicks softly at full stops from f2.8 thru f16.
It is tack sharp in the center at f2.8. The corners fall off steeply but by f5.6 the whole frame is consistently sharp.
Fringing is not a concern with this lens.
It will flare if pointed into the light but it does not need a lens hood for side lighting.
Contrast is a but high but it is consistent and the lens has decent shadow detail. Highlight blowout is well controlled.
Color rendition is neutral and saturation is normal.
Distortion is very low Only minor corrections are needed in architectural shots.
Black and white rendering is excellent.
This is a great street lens for full or sub frame cameras.

6D

F2.8

F4

F5.6

F2.8 - 100% crop

F4 - 100% crop

F5.6 - simple b/w conversion

F5.6 - simple b/w conversion

(T2i)

F4

F4 - low distortion

F4 - low distortion