SDM focus problem 645 90mm - PentaxForums.com

11-05-2018, 09:21 AM	#1
ivanvernon Loyal Site Supporter Join Date: Oct 2012 Location: Medina, OH Photos: Albums Posts: 7,224	SDM focus problem 645 90mm Has anyone else had problems with the SDM focussing on the Pentax-D FA 645 90mm f 2.8? Mine works irregularly and unpredictably. Sometimes it does not work at all. Other times, it may work once or twice and then stop working. Any comments appreciated.

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