Your 20-40 is a DC motor lens, not SDM. Now I have two SDM lenses, a
16-50 2.8 and 50-135 2.8, the 16-50 is fast enough, the 50-135 is slow
to focus, although its speed improved when it had its SDM motor changed
after it broke down. The 50-135 is very good at follow focus, though. I
also had
Every SDM lens I have used has been dog slow. My Bigma crushes the
60-250 in terms of focusing speed. My 20-40 is pretty slow too.
Thankfully I rarely shoot action. The SDM lenses seem to hunt less but
they do seem to micro adjust a lot which makes focus kind of on the
slow side. the 17-70 i have
On 5/24/2016 11:40 AM, Larry Colen wrote:
One of the reasons that I was interested in the DA 55 was that having
its own motor, I thought it should focus more quickly. When I was using
it the other night to photograph dancing, however, it seemed really slow
to focus. It also seemed to need to
Bruce Walker wrote:
To me, all the SDM's are kinda sluggish to focus, especially in really
poor light. I found the benefit to the SDM motor to be largely the
quietness and accurate focus, not the time to acquire focus.
The quietness is very nice.
I automatically just manually focus in low
To me, all the SDM's are kinda sluggish to focus, especially in really
poor light. I found the benefit to the SDM motor to be largely the
quietness and accurate focus, not the time to acquire focus.
I automatically just manually focus in low light. In acceptable light
though, they snap quickly
One of the reasons that I was interested in the DA 55 was that having
its own motor, I thought it should focus more quickly. When I was using
it the other night to photograph dancing, however, it seemed really slow
to focus. It also seemed to need to "hunt focus" more than a lot of
lenses,
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