Forgive me if this has already been discussed, but I couldn't find it in the search...
OK, so I'm ready to put down some cash for a new zoom, either the 16-45 or DA 17-70. The latter is kind of a reach price-wise, so sadly don't even bother bringing up the 16-50.
I've owned a 16-45 before and loved it. It's the only lens I've truly regretted selling.
The extra reach of the 17-70 would be nice, but that's not enough to pay an extra couple hundred bucks.
It really comes down to SDM -- is it really that much faster than a regular old screw drive on a K20D? If yes, I will probably go for the 17-70. If no, I've probably run out of excuses to spend the extra dough.
Thoughts?