Originally posted by zapp Was Pentax SDM just marketing or a failure?
You'll likely only get conjecture from those of us here.
So conjecture I'll supply..
I suspect SDM was/is a failure due to both user sentiment snowballing into hysterics online and the general slowness to focus vs competing technologies... even though it wasn't/isn't terrible.
If Ricoh was offering screwdrive, SDM, or DC in a lens I'd pick DC every single time. It is fairly silent, quick, and reliable. With screwdrive you can pick two from that list. With SDM you can pick the other.