Nikon D780 - The X ( T ) Button; Adjusting Image Quality

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Camera Controls
The
X
(
T
) button is used to adjust image quality and choose
the size of JPEG images.
Adjusting Image Quality
During viewfinder photography, image quality can be adjusted
by holding the
X
(
T
) button and rotating the main
command dial.
The
X
(
T
) Button