Originally posted by Dice Hi Jrobe you might do some searching on the forum. This subject has come up quite a bit. Here is one
thread. And there are others. Most recently, Heie did a review of the Sig 18-35 where both the 20-40 and 16-50 were also compared. I had both. And both are nice lenses. For the money, If you really want the 16-50, I wouldn't buy it new. The weaknesses of the lens are not worth the cost in my humble opinion. I still have the 20-40 and while far from perfect it delivers on what I wanted in this focal length.
Like I said above I have searched and found a couple threads, not many have had both lens. The reviews of the 16-50 all seem to praise other lens over it, but user reviews seem to praise it less the sdm motor failures. I am considering used on the DA*, and if I may ask what are the weaknesses in your opinion besides the motor? I appreciate the responses, I keep thinking the 20-40 being smaller will be easier to lug around, but having a better weather resistance on the DA* is worth the extra size and weight. I can't help but think that Pentax will be updating the * series soon with HD coatings, I'm surprised they haven't yet with the recent price drops. I'm leaning towards the DA* strongly, but love the look of the 20-40mm haha and the reviews are quite strong at similar focal lengths compared to the 16-50