Nikon D750 DSLR Camera (Body Only) - Manual (Page 286)

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To delete the photograph displayed in full-frame playback or
highlighted in the thumbnail list, press the
O ( Q ) button. To
delete multiple selected photographs, all photographs taken on
a selected date, or all photographs in the current playback
folder, use the
Delete option in the playback menu. Once
deleted, photographs can not be recovered. Note that pictures
that are protected or hidden can not be deleted.
Full-Frame, Thumbnail, and Calendar Playback
Press the O ( Q ) button to delete the current photograph.
1
Press the O ( Q ) button.
A confirmation dialog will be
displayed.
2
Press the O ( Q ) button again.
To delete the photograph, press the
O ( Q ) button. To exit without
deleting the photograph, press the K
button.
Deleting Photographs
O ( Q ) button
O ( Q ) button