Nikon D810 Product Manual - Page 383
f17: Lens Focus Function Buttons, is selected
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f17: Lens Focus Function Buttons G button ➜ A Custom Settings menu Choose the role played by the focus function buttons on the lens. The buttons can be used for the assigned function only when AF-L is selected with the focus function selector. Focus function buttons Focus function selector Option Description F AF lock only Focus locks while a focus function button is pressed. B AE/AF lock Focus and exposure lock while a focus function button is pressed. C AE lock only Exposure locks while a focus function button is pressed. v Preset focus point Keep a focus function button pressed to select a preset focus point (0 342). Release the button to restore the original focus point selection. Highlight this option and press 2 to select an AF-area mode (3D-tracking excluded; 0 90). The selected mode will take effect while a focus function K AF-area mode button is pressed; releasing the button restores the original AF-area mode. The lens focus function buttons can not be used to choose the AF-area mode during autofocus if 3D-tracking is selected using the controls on the camera. 359