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
Sometimes what looks like atmosphere is merely lack of contrast due
to the design. I saw some slides projected once with shots with
1000mm Nikon reflector compared with a 1000mm Leica refractor and the
differences were not subtle. The Leica shots were richly colored and
contrasty while the Nikon shots looked like multigeneration copies
with no color and no contrast. I know Nikon knows how to make good
lenses too, so I think it was the difference in design. When contrast
and color saturation are marginal anyway and a long shot through the
atmosphere will completely wipe it out.
--
Winsor Crosby
Long Beach, California
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