Reviews and Problems with Pentax smc DA 50-135mm F2.8 ED [IF] SDM
Showing 1-2 of 2
Few redeeming qualities
Dewy N. Howe, Amazon
18 February 2015
Summary: I am a devoted Pentax (or whoever the company is now) customer and this is the lens that should have a free recall. but I'll get into this is a bit. Given the money this lens costs, I am sorry I ever bought it; yet, at any price, it is almost worthless.
Summary: 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.