Hi Charles,
Two things I didn't see mentioned in the other answers:
- Someone mentioned that f8 is a 'reasonable' aperture. At 500mm, f8 has
very little depth of field, making certain shots impossible.
Conventional teles may require tripods (as does real sharpness), but the
f-stop required for adequate DOF and associated shutter speed often
require it anyway.
+ Mirror lenses usually focus quite a bit closer than regular teles.
I have 350/5.6 and 500/8 Tamron SPs which are great to carry for
'in-case', but I use my Tokina AT-X 150-500mm/5.6 for any serious long
lens work. I also have a 1000/11 mirror, but that gets into the
territory where the state of the atmosphere becomes almost more
important than the lens. Ths Tokina also focuses closer than most
conventional 500mm teles, 2.5m, 1:3.5.
Moose
Charles Monroe wrote:
What are the pros and cons of a long focus versus a mirror lens of
the same effective mm length?
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