Pentax K-5 Operating Manual page 22

X -s y n c Sockei
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You can connect an external flash to the _=d_
connectsocket,cameraRemoveWith a the sync async sync cord s ocket cord to the bY2Px_sync using cap the and socket. X-sync _1 ---- ...........
• The use of high-voltage or high-current external flashes may cause a camera
breakdown.
• Flashes with reversed polarity (the center of the sync plug is minus) cannot
be used due to the risk of damaging the camera and flash.
• When a sync cord is connected to the X-sync socket, linked functions will not
work.
• To prevent vignetting caused from Trailing Curtain Sync, it is recommended
to take a test shot using a shutter speed one level slower than the flash sync _
speed. 5"
• The contact of the X-sync socket is not dust-proof and water-resistant. Attach
the provided Sync socket 2P cap when not in use.