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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Canon 28-135mm f3.5-5.6 IS USM
This is a nice lens. Build quality is not confidence inspiring but when you see the results you quickly forget the lens wobble and cheap feel. This lens has excellent highlight and shadow detail. It is more like a Takumar than a Canon in its image rendition. It has very little flare and shows only a small amount of chromatic aberrations in the form of minor fringing in extreme contrast scenes. At 135mm the lens is tack sharp at f8-11. That's impressive for a wide-tele zoom. Image stabilization is very effective. Focusing is accurate on my T2i. Bokeh is smooth. This lens is exactly what it was designed to be, a great multi-purpose wide-tele zoom.
Eos M3 - APS-C