Canon EOS 80D - Manual (Page 184)

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The image files will be numbered from
0001 to 9999 in the order the images are
taken, then saved in a folder. You can
change how the file number is assigned.
1
Select [File numbering].
 Under the [51] tab, select [File
numbering], then press <0>.
2
Select the file numbering method.
 Select the desired setting, then press
<0>.
Continues the file numbering sequence even after the card is
replaced or a new folder is created.
Even after you replace the card or create a new folder, the file
numbering continues in sequence up to 9999. This is useful when you
want to save images numbered anywhere between 0001 to 9999 on
multiple cards or in multiple folders into one folder on a computer.
If the replacement card or existing folder already contains images
recorded previously, the file numbering of the new images may continue
from the file numbering of the existing images on the card or in the
folder. If you want to use continuous file numbering, it is recommended
that you use a newly formatted card each time.
3
File Numbering Methods
(Example)
IMG_0001.JPG
File number
Continuous
File numbering after
replacing the card
Next sequential file number
File numbering after
creating a folder
Card-1 Card-2
0051 0052
Card-1
100 101
0051 0052