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Message: <blockquote data-quote="BackdoorArts" data-source="post: 591516" data-attributes="member: 9240">I truly believe the 3D mode is your issue. I've been shooting a ton with the D500 and my Sigma 150-600 Sport and I almost never use 3D mode because I find it extremely unreliable, particularly in situations like your shot above. I will generally use AF-C with 153 dynamic point AF when trying to track birds like this.  It allows me to lock focus initially and then it will track throughout the 153 point band across the center of the frame (which is so sweet on the D500) attempting to maintain a lock on the object under the initial point throughout. Unless the movement is almost exclusively towards/away from you and you are able to keep the focus point directly on your subject (something that takes a lot of work with that lens and a flying bird) 3D will, in general, quickly find something else to focus on.  I also use Release mode with AF-C. You may also want to play with your Focus Tracking setting (Custom Menu a3) with I generally have a the most delayed setting.Steve Perry is a wonderful wildlife photographer and D500 user and my settings come from a lot of trial and error after watching his videos and reading a lot of his D500 posts on the Fred Miranda forum.  It's important to understand precisely how each of Nikon focus modes work and what other settings can impact how focus locks and for how long.  This is a video he did prior to the release of the D500 but everything in it is perfectly valid in the post-D500 world.  You can also venture over the FM forum and peaking the Nikon subforum for his various D500 posts, most in reply to questions like yours (sorry for sending folks elsewhere, but if there's meat someone and the person's hungry...)[MEDIA=youtube]_N_bzhJAKms[/MEDIA]</blockquote>

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