Title: SDM Failure
Product review: The SDM (which is the focus mechanism) failed on this lens within a few months of purchase.The pictures are decent, but I can get better ones with my old Russian manual focus 135mm lens that cost $35 on ebay.It seems that very many people who bought Pentax SDM lenses experience this failure.Pentax repaired it under warranty but it still functions sub optimally in terms of focussing. I'm using it on a K7 body.It's a shame that Pentax sell such a poor quality product for such a fat stack of cash.
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