Originally posted by asdf From a practical standpoint, the main problem with this lens appears to be the reliability of the SDM motor and scarcity of Pentax repair centers. In Canada, there is only one center qualified to fix these lenses.
Bummer, I had no idea there was only one qualified service center in Canookia. No wonder I read people talking about glacially slow repair times. At least here in the US they have gone to CRIS as the main service center...I've had wonderful experience with them.
As for the 16-50 I researched the beastie a fair bit when I made my initial plunge into Pentax this past July or was it June? No matter, what stopped me from buying a copy was not just the SDM potential failure but more so it was the other build issues such as decentering and other things which should not sneak through. I really use this range a LOT it was supposed to replace the Sigma 24-60/2.8 I had with my 40D and was solid as a rock save zoom creep all copies seemed to eventually develop. But instead I grabbed a 50-135 which, suffered crib death of the SDM in the first 30-days. go figure, likely I over thought things...
but I ended up with all primes to start in the 35ltd, 43ltd & 77ltd instead of either of the DA* zoom the 35ltd and the 77ltd.
Still, I am hoping we begin seeing less and less reported issues with the 16-50 or even better a newer updated version of SDM this year. If Pentax can shake that black cloud then the DA* are gonna be in my bag...until then I would rather buy the better primes which I never read of having and problems. And what keeps me out of the SDM camp is not only the fact my very first SDM lense failed almost out of the box, but that most reported failures are very soon after the warranty expires...something like that is more worrisome to me as eventually I expect modern zoom lenses with some sort of ultrasonic AF to need, at a minimum a good CLA experience and at worst a repair of the AF components after several years...but in under 2-yrs it seems to happen all to frequently.
But enough of me taking this thread OT...sorry about that...just found the discussion interesting.