Canon ZR80 Instruction Manual page 94

You can choose between 320 x 240 pixels and 160 x 120 pixels.
MENU([_3 39) CARD SETUP 1_ MOVIE SIZE...320x240
Open the menu and select [CARD SETUP]. Select [MOVIE SIZE], set it to
[160×120] and close the menu.
:b Movies are recorded in ttqe Motion JPEG format.
:b Maximum recording time on a 8MB SD Memory Card:
Max. Recording File Size per Second
Image Size Time (8 MB)
320 x 240 approx. 20 sec. 250 KB/sec.
160 x 120 approx. 50 sec. 120 KB/sec.
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