Originally Posted by club.dead 
wow! Guys, could you help me with choosing between 17-70 and DA*16-50. I have my k200d with 50mm f1.4 and I do really need some more wide angles and to zoom a bit.
Maybe, best help would be to save you from blowing your hard earned money on your hobby.
But seriously...to me, DOF was a concern. See whether, in some cases, you'd really want shallower DOF between 17 and 50 which DA* would give you. As for weather sealing, 17-70 has a rubber ring in the mount and you can put some kind of cover on top of the lens itself in case of snow or rain.