gldnbearz escribió:
I purchased a used DA 16-50 from B&H, rated at 9+. I put the lens on my K200D and immediately realize that the lens won't auto focus. I check the AF/MF switches on both the camera body & lens to make sure that all was in the AF position (or rather, none was in the MF position). I can manually focus the lens without problems. I have also cleaned the SDM contacts on the lens, without any success. Camera focuses fine with the DA 50-135 lens, so I doubt it is a problem with the SDM on the body. OTOH, when I place the lens on the *istDS, the lens will auto focus. I'm guessing that the SDM component on the lens has failed. If that is the case, will it not revert to the standard screw drive on a body that has SDM ability?
I have a DA 50-135 which has developed exactly the same problem, namely: screwdriver focusing works on an *ist DS, but SDM doesn't (on a K10D GP). You should return that lens.
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