Canon 70-300 IS USM AF issue

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661
Name
Ben
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Hi guys,
i have just recently bought this lens 2nd hand, although its only 2 months old. I have tried various setting but the AF system seems stupidly searchy. I used to have a crappy Sigma 70-300 APO and the AF on the canon seems so much worse. Is this normal or am i doing something wrong? Ive only been using it on light a/c flying over my flat or OTT's at about FL160 to FL220. My sigma used to lock on quickly to these subjects. Any help would be appreciated.

Ben
 
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