Jim Davis wrote:
>
> > Focusing speed should not be a major problem with wide angle lenses.
> > E.g. the Canon EF 20-35mm L isn't USM as well - and I've never had a
> > problem with the lens focusing too slow.
> >
> > Thomas Bantel
>
> Ya, well my 20-35 non L does have USM, and frankly I love it. It's USM from
> now on for me on every lens I buy. I love the way people without USM say
> they don't miss it. Of course you don't, you don't have it. I have it, and I
> would miss it...
All my non L wide angles are pretty much fast enough for me. And I have
plenty of USM lenses to compare with, including the 20mm prime. Yes,
they *are* faster, but I don't really need the last bit of speed in my wide
angles. At 20mm you won't even need AF for anything but closeups. Just
prefocus roughly and let DOF do its thing. One thing I miss sometimes in
the non USM wide angle lenses is FTM focusing, but I have never missed
the speed. Besides, the 20-35L is pretty fast for a non USM lens, as is
the 80-200L BTW. Now, if the Tamron is as slow as my old Sigma 28-70/2.8,
I *would* miss USM ;-)
Thomas Bantel
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