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Tamron SP 500mm f/8 Compare Prices

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SP 500mm f/8

Rating: 4 out of 54 out of 54 out of 54 out of 54 out of 5

Catadioptric lens. The lens has only one aperture, f8, and is 'wide open' all the time. You would use neutral density filters if needed, but there is no aperture as such, due to the two mirrors in the light patch, which would make diaphragms impossible.