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Latest Review Posted Tamron Adaptall-2 SP 500mm f/8 Mirror (55BB)
Spent several weeks reading mirror lens reviews on the net. Finally I decided for the Tamron because of its long focus throw.
Unlike other mirror lenses (Samyang et al), this one has a focus throw of almost 360. Still, the DOF is so thin that every milimeter on the focus ring counts.

The key is to use a tripod, mirror lockup and be very accurate with focus, then this lens provides perfect results. My first 5 shots or so were bad, then I learned that I absolutely have to use a sturdy tripod, mirror lockup, 2 second timer and remote.
Also, with 500mm, air pollution and air movement suddenly becomes an issue.

If you're doing it right, this lens provides stunning images.

My guess is that the bad reputation of mirror teles is mostly due to people not being able to use them correctly. They handle like kit lenses, that's probably why noone bothers using a tripod and then blames the mirror construction for the bad results.

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