Trailing Curtain Sync; Connecting An External Flash With An Extension Cord - Pentax K-7 Operating Manual

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Trailing Curtain Sync

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