roy_lang Posted August 26, 2009 Share Posted August 26, 2009 <p>I have an auto focus problem with 50mm 1.4 lens when shooting close portraits. It is just a small turn out of focus but noticeable when zoomed in. It will focus on manual clearly but can't understand why it stops out of focus in auto. Is there something I can do to adjust focus?</p> Link to comment Share on other sites More sharing options...
robin_sibson1 Posted August 26, 2009 Share Posted August 26, 2009 <p>Roy, if you do a search you'll find any number of threads (many of them with posts by me) commenting on the design weakness of the 50/1.4 that leads to AF failure. I am afraid that what you are describing sounds like the early stage of that failure. If so, a trip to Canon or a good independent repairer is going to be needed. However, if it's only a small effect then it might be no more than a calibration issue, or it might be simply focusing system behaviour that is shown up most clearly at very wide apertures, caused – for example – by the user not realising that the focusing "points" cover much larger areas than the size of the boxes suggests.</p> Link to comment Share on other sites More sharing options...
Ian Taylor Posted August 26, 2009 Share Posted August 26, 2009 <p>I had to have the focusing motor replaced on mine. Known problem with this lens.<br> Get it checked out.</p> Link to comment Share on other sites More sharing options...
eric_washburn Posted August 26, 2009 Share Posted August 26, 2009 <p>Focusing--both manual and automatic--recently went out on my copy. Canon fixed it for $95, including return shipping from their facility in NJ. You might want to look at this link:<br> <a href="http://www.usa.canon.com/consumer/controller?act=OnlineRepairBookingAct">http://www.usa.canon.com/consumer/controller?act=OnlineRepairBookingAct</a></p> Link to comment Share on other sites More sharing options...
roger krueger Posted August 27, 2009 Share Posted August 27, 2009 Yeah, at least it's a cheap fix. I've killed my 50 three times (I shoot punk shows, shit happens). But restoring the AF on my 24/1.4 cost $250 (I'm assuming because the floating element makes it a PITA to take apart.) <br><br> The problem is that the front moves during focusing. So any blow to the front is a blow directly to the focusing mechanism. The lens-specific Canon hood attaches to the non-moving part of the lens and provides protection. Link to comment Share on other sites More sharing options...
felix_mizioznikov Posted August 27, 2009 Share Posted August 27, 2009 <p>get to know the micro a/f adjustment feature on your camera. if you use a 50d or better you could adjust where your actual point of focus is</p> Link to comment Share on other sites More sharing options...
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