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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Helios Filter Size Chart
Various Mounts
28mm f2.8
Helios-81 50mm f/2
Helios-77M-4 50mm f1.8 MC
Helios-123N 50mm f1.4 MC
Helios-94 50mm f1.8
Helios-65 52mm f2
Helios-103 53mm f1.8
Helios-81M 53mm f2 MC
Helios-44M 58 mm f/2
Helios-44K-4 58mm f2 MC
Helios 44-2 58mm f2 (Zebra)
Helios-44
Helios 40-2 85mm f1.5
Helios-40 85mm f1.5
Cyclop T3C-2 100mm f2
Helinon 135mm f2.8 Auto MC
49mm
52mm
52mm
52mm
49mm
49mm
40.5mm
49mm
52mm
52mm
52mm
40.5mm
67mm
66mm?
52mm
52mm