Canon A50 - Manual (Page 87)

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Menu Featur
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File No. Reset
The method by which the camera assigns file
numbers can be selected.
The file no. reset [On] setting resets the starting
file number to 1 (100-0001) each time a new
CF card is inserted. On cards with existing files,
the next available number is assigned.
The [Off] setting starts the file number on a
new CF card at a number one higher than the
last number assigned to the previous CF card.
For example, if the file no. 100-0005 is the last
shot recorded on a CF card, the first shot on
the next CF card will be assigned the file no.
100-0006.
• Since the Off option avoids the
duplication of file names, this setting is
convenient for processing images on
computers.
About File Numbers
Images can be assigned individual frame
numbers ranging from 0001 to 9900. Each
folder holds up to 100 images, and the
folder numbers range from 100 to 998.
100 0001 0002 0099 0100
101 0101 0102 0199 0200
198 9801 9802 9899 9900
200 0001 0002 0099 0100
Folder numbers cannot contain 99 in the last two digits.