oleksa_borodie Posted April 28, 2009 Share Posted April 28, 2009 <p>I've bought DA*50-135/2.8 and it failed to autofocus in four month after purchasing. Used two or three times for a week with K200D body.<br> When shutter button is half-pressed no focusing operations are performed. When shutter button is full pressed out of focus mark is blinking and no picture are taken. It is a very pity because of good mechnical and optical lenses quality. Manual focus works very well. Tomorrow I will try to return lenses back to the shop. Seems that USM drive are broken :-(</p> Link to comment Share on other sites More sharing options...
jgredline Posted April 28, 2009 Share Posted April 28, 2009 <p>I should know this but will the DA*50-135 work as a screw drive autofocu lens?</p> Link to comment Share on other sites More sharing options...
rogerdaltx Posted April 28, 2009 Share Posted April 28, 2009 <p>Yes both the DA* 16-50 and 50-135 will work as scew drive lenses. <br> I've owned both bor about 18 months, The 50-135 is used a few times a month no issues and a wonderful lens. My 16-50 was used weekly. The focus started sticking and was very slow to lock on SDM but worked on on screw drive. It was warrenty exchanged by Pentax's Colorado service center after owning it for about eight months. The replacemenmt has been fine but I don't use it nearly as often since I bought the Tamron 28-75 while it was off for repair.</p> Link to comment Share on other sites More sharing options...
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