Canon EOS 30D Instruction Manual page 120

Image Playback
3 Automated Playback of Images (Auto playback)
You can playback the CF card's images in an automatic slide show.
Each image will be displayed for about 3 sec.
During auto play, auto power off will not work.
The display time may vary depending on the image.
During auto play, you can press the <B> button to change the
display format.
During pause, you can turn the <5> dial to view another image.
120
Select [Auto play].
1
Turn the <5> dial to select [x
Auto play], then press <0>.
The auto play screen will appear.
Start the auto play.
2
After [Loading image...] is displayed
for a few seconds, auto play will start.
To pause the auto play, press <0>.
During pause, [ ] will be displayed
on the upper left of the image. Press
<0> again to resume the auto play.
Stop the auto play.
3
To stop the auto play and return to the
menu, press the <M> button.