Kenneth Waller
http://www.tinyurl.com/272u2f
----- Original Message -----
From: "Sandy Harris" <[email protected]>
Subject: How useful is SDM?
I have never used an autofocus system. I find myself comparing lenses
with an SDM motor to ones without. For example, the 17-70 f4 has SDM
but 16-45 does not. 55/1.4 does but 50/1.4 and 70/2.4 do not.
There are plenty of other differences -- notably price, weight and
focal length -- and I have some idea how to balance those in relation
to my usage and preferences. However, I don't have much idea how
important or useful the SDM motor is, so I am asking here.
Is this something that should be ignored in making a choice? An
important factor? Somewhere between?
I've got both types of auto focus system lenses.
For me, it's the optical performance of the lens that overrides most other
considerations, although the quietness of the SDM system is very nice.
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