Pentax K-5 Operating Manual page 165

Multi-image Display Screen
You can display 4, 9, 16, 36 or 81 thumbnail images on the monitor at the
same time. The default setting is nine image-display.
1 Turn the rear e-dial (;,,_I_,, _) to the
left (toward €;'J)in Playback
mode.
The multi-image display screen
appears.
Up to nine thumbnail images are
displayed at once.
Selection frame
Scroll bar