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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Soligor 80-200mm f4.5 C/D
f4.5 - f32
This lens has strong positives and strong negatives. I was hoping it would be as good as the 28-80 C/D but it isn't.
First, the positives: Wide open in macro mode it is sharp and usable. Macro with this lens gives a separate focusing range of approx 12" to 6 ft @80mm. It is sharp and mostly free of distortion with little to no vignetting and fringing in macro mode.
And the negatives: You will see purple fringing and stopping down has little effect on it. Vignetting is excessive at 200mm. Backlit images suffer from a pronounced reduction in contrast. It is worst at 200mm. Stopping down helps but contrast is never good.
And, the neutrals: Contrast is low across the entire zoom range and in macro mode. The glass itself is capable of producing sharp images but the design hinders its performance.
Conclusion: If you need a cheap macro for flowers and lichen, etc., this lens will please you. If you are looking for a sharp, general-use telephoto, you are out of luck.
Note: The copy I tested was made by Sun Optical.
Macro range, approx. 3 feet - f4.5
Macro range, approx. 1 foot - f4.5