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Message: <blockquote data-quote="cwgrizz" data-source="post: 535732" data-attributes="member: 27017"><p>I am going to guess that it is just trying to find focus, but in low light it is having problems.  You need to try it out in a good light (sunny day) to see how it behaves.  I have a Nikon 70-300 which at times has a little problem focusing at times and goes in and out.  I would try focusing on a stick or something in the grass using single point focus to see what it will do.  All just guessing on what is going on as I have not seen the lens you have.</p></blockquote><p></p>