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Message: <blockquote data-quote="TN Mike" data-source="post: 233146" data-attributes="member: 11464"><p>Recently added a Sigma 70-300 DG Macro lens to my Nikon D5100. This lens will not "lock" into focus when attempting to focus on objects at the extreme end of the telephoto (200-300mm).  The focus will lock in focus and then immediately go out of focus and then re-lock.  I am using a tripod and have tried several different setting on the camera. All settings on the camera and lens have been checked and double checked.  Nothing seems to solve the problem. This is my first Sigma lens so any help or advice anyone can give would certainly be appreciated</p></blockquote><p></p>