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Message: <blockquote data-quote="yauman" data-source="post: 292000" data-attributes="member: 15418"><p>So it looks like your Sigma lens is not meant for you to manually focus when you are in the autofocus mode - but with the D7100 you really shouldn't have to.  And no need for flipping the switches back back and forth. Read up how to use the AF-S or AF-C autofocus mode. All you have to do is spot focus on the bird and your camera will do the rest.  From the first 2 pictures, it looks like your are in the AF-A (51-pt) mode, where it's using all the 51 focus point and optimizing the focus on the nearest thing - ie the thorns and the branches.</p></blockquote><p></p>