Reviews and Problems with Pentax smc DA 50-135mm F2.8 ED [IF] SDM
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Hugh Mann, Amazon
1 March 2013
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. Pentax repaired it under warranty but it still functions sub optimally in terms of focussing. I'm using it on a K7 body.
Excerpt: When I first got this lens, my initial thoughts were "wow, this thing is gorgeous". I love the gold highlights, the green line near the mount, and the massive zoom and focus rings. The large front element makes this lens look like it means business. This thing looks fantastic.
Pros: Excellent image quality at all focal lengths, outstanding build quality, looks gorgeous, super silent focusing, great hood, internal zoom and focusing, weather sealing