Sony DSLR-A850 - Manual (Page 123)

Playba
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Playback menu 2
Repeatedly plays back the recorded images in the memory card. You can
view the previous/next image with b/B on the multi-selector.
To pause the slide show
Press the center of the multi-selector. Pressing again starts the slide show
again.
To end in the middle of the slide show
Press the MENU button.
Slide show
Interval
30 sec The image switches at the selected interval time.
10 sec
5 sec
3 sec
1 sec