You may just have the left auto focus points selected. You don't say which camera model you have. If on the back of your camera you can see a button with an icon showing 5 small white blocks in a plus sign in a white box press this to select the auto focus points. It should show the available auto focus points and then use the left/right (wheel) button to change the selection
SOURCE: lens auto focus sometimes does not work.
First make sure contacts on lens are clean ( see enclosed pic #2 ) . If this does not solve the problem the ultrasonic motor may be faulty pic #1.( sometimes switching on but sometimes not , will have to be replaced , unless there is a bad connection between the motor and lens pc board )
#1 #2
SOURCE: cleaning inside Canon 50mm /f1,8 II
Hi,
you can have a look here:
http://www.ejarm.com/photo/ef5018iidis/
and here:
http://nis-lab.is.s.u-tokyo.ac.jp/~ybando/rgb_filter/disassembly.pdf
HTH,
Jean-Marie.
SOURCE: Auto focus not working?
1st u reset the factory setting and then u see the lense is correctly fitted or not and the autofocus option is working or the manual focusing is there or not
SOURCE: canon EF 50mm 2.5 macro autofocus broken. buy new
Given the cost of this lens new, it's worth asking a repairer for an estimate. Protech Photographic, Uckfield may be able to help
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