Pentax K-r - Connecting an External Flash with an Extension Cord

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Using the Flash
5
When using the built-in flash with an external flash that does not have a
wireless flash mode function such as AF200FG, attach the Hot Shoe
Adapter F
G (optional) to the camera hot shoe and an Off-Camera Shoe
Adapter F (optional) to the bottom of the external flash, and connect these
with the Extension Cord F5P (optional) as shown in the illustration below.
The Off-Camera Shoe Adapter F can be mounted to your tripod using the
tripod screw.
Only a P-TTL auto flash can be used in combination with the built-in flash.
When combining with the built-in flash
Connecting an External Flash with an
Extension Cord
Trailing Curtain Sync
When using the built-in flash with an external flash (AF540FGZ or
AF360FGZ) that is set to the Trailing Curtain Sync mode, the built-in
flash will also use this mode. Confirm that both flash units are fully
charged before shooting.