Nikon Df - Manual (Page 275)

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U
When a photograph is taken, the camera
names the file by adding one to the last file
number used. This option controls whether
file numbering continues from the last
number used when a new folder is created,
the memory card is formatted, or a new
memory card is inserted in the camera.
d7: File Number Sequence
G
button ➜ A Custom Settings menu
Option Description
On
When a new folder is created, the memory card formatted, or a
new memory card inserted in the camera, file numbering
continues from the last number used or from the largest file
number in the current folder, whichever is higher. If a
photograph is taken when the current folder contains a
photograph numbered 9999, a new folder will be created
automatically and file numbering will begin again from 0001.
Off
File numbering is reset to 0001 when a new folder is created,
the memory card is formatted, or a new memory card is
inserted in the camera. Note that a new folder is created
automatically if a photograph is taken when the current folder
contains 999 photographs.
Reset
As for On, except that the next photograph taken is assigned a
file number by adding one to the largest file number in the
current folder. If the folder is empty, file numbering is reset to
0001.
D
File Number Sequence
If the current folder is numbered 999 and contains either 999
photographs or a photograph numbered 9999, the shutter-release
button will be disabled and no further photographs can be taken.
Choose Reset for Custom Setting d7 (File number sequence) and then
either format the current memory card or insert a new memory card.