Originally posted by Frogfish JJ. Many people prefer the Tamron very sharp 17-50/2.8 (very similar price to the 16-45) to the far more expensive Pentax 16-50 which may often be over-rated by Pentaxians. It's had very mixed reviews. Check out the thread for photos taken by Tamron lenses here on PF.
+1, I have the 16-50mm, bought it in 2008 when the Sigma 17-50mm f2.8 was not around. Otherwise, who knows...
At f4 and above the 16-50mm does excellent work.
However, given a good specimen, the Sigma does a little better at much lower cost. Alas it does not have WR.
If I believe the test guru's around the world, the 17-50mm f2.8 is about the best zoom lens Sigma has ever made...
You've ordered a K-r? Good choice. Avoid the kit lens.
The 16-45mm is a very good lens as well and can be found a very low prices on the Internet.
Cheers, Bert