I have the FA 50 f1.4 & the DA* 50 - 135mm f2.8. My own experience has been
that the DA* focusing is better: quieter & faster. Though I should say
that I don't really test equipment like the guys on the list do. Bill
Robb's comments should be taken seriously, but, again, my own experience has
been the DA* focusing is so much better. I'd like to purchase the DA*
primes, but that's not really in the cards now, but if I could, as I say, I
would. I should also say that I don't own the DA* 16-50mm f2.8, and have
never really coveted that one--I would admit to being nervous in buying that
lens because of all the stated reasons. If you want a medium-tele zoom, buy
the DA* 50-13mm. You won't regret it. Cheers, Christine
----- Original Message -----
From: "Sandy Harris" <[email protected]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Sunday, January 10, 2010 2:24 AM
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?
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