Originally posted by creampuff I'm picking up an SDM lens pretty soon myself. Am I worried? Not a bit because I've never had any issues with SDM lenses, so I think the issue's been overblown and plus we have the backing of an excellent local service dept.
That's nice.
I tried to tell myself the issue was overblown back when I was trying to decide whether or not to get the DA* 50-135mm. It really is optically excellent, it's the perfect focal range for my needs, it's weather-sealed... everything about it was perfect, even the price. But the rampant complaints over SDM made me second-guess myself more than once. I frequently wavered between alternatives, based solely on the whole SDM thing. In the end, I decided that SDM couldn't possibly be as bad as it's made out to be on this forum and I bought a brand new one from Beach Camera.
When I received it, I put it on my camera and it refused to focus. It was completely dead. The focus mechanism refused to budge on its own. I tried putting on the kit lens, it worked fine, and then switched back to the DA* 50-135mm... still nothing. Dead as a doorknob. I sat there, dumbfounded... thinking of the money I just sank into this lens and all the hassle I'd have to go through to get it exchanged.
Then I stubbornly tried it again. The focus mechanism just barely started creeping forward, and finally the lens achieved a focus lock. Subsequent uses seemed to "wake it up", and eventually it go to the point where it was focusing as quickly as my kit lens. I sat back and breathed a sigh of relief.
3 weeks later, the same thing happened. I hadn't used the lens for a couple of days and I put it on the camera, and it refused to focus. The dread took over me again. Eventually it "woke up" and started working as expected.
So essentially, I gave Pentax $800 of our hard-earned money for the privilege of waiting for my top-class lens to fail. My DA* ownership experience so far involves being gripped with fear that it will inevitably stop functioning. I really don't give a damn about the anecdotal evidence you've been able to gather in Singapore, SDM has already lived down to my worst fears, no matter how hard I tried to convince myself that those fears were unfounded. I should've listened to Damn Brit when he told me not to buy one.