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Forum: Pentax SLR Lens Discussion 04-13-2014, 10:42 AM  
50-135 -- SDM or Screw -- what's faster?
Posted By AquaDome
Replies: 8
Views: 2,479
Screw-drive is faster than SDM on the 50-135. I have used it on an SF1, ZX-50, K-50, and K-3.
If you don't require SDM and CRIS will repair it for screw-drive only, go for it.
While I wouldn't deliberately disable SDM, the redundant screw-drive system makes SDM failure a "champagne problem" IMHO.
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