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 light. In acceptable light though, they snap quickly into focus with no hunting around the focus point. If it's hunting to the end stops then you have definitely got too little light. But focus isn't entirely an attribute of the lens, it's a system where the camera body and the lens both play a part. If you can't focus a DA* 55 in some given light, do you think that any other Pentax lens would focus? I rather doubt it.
I will note that it seems to have done a good job once it acquired focus. It's just that the process was a bit slow.
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