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Confirm lever switch near lens barrel (lower right front when viewing from front) is on AF not M.
Press button in hub of same lever switch and look through view finder to see if camera is on AF-S or AF-C. You want AF-S (single focus) not AF-C (continuous focus) for these shots. Rotate the command dial on back (right thumb) to scroll between the two.
Go into Menu>Custom Setting Menu>Autofocus>A2 (AF-S) Priority Selection and Choose Focus. This means the shutter will only release if focus is achieved.
While in Autofocus, scroll down to A8 Autofocus Activation and choose Shutter/AF-On. This allows either the shutter button or AF-On button to be used for acquiring focus.
If it is set to AF-On it will do as you describe. This is useful for locking tracking on subjects in motion. Your thumb stays on AF-On you can fire the shutter at will while panning.
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