Pentax ES - Flash Synchronization

Asahi Pentax ES Operating Manual Excerpts
Reproduced for Historical and Reference Purposes by Paul M. Provencher
http://whitemetal.com Not For Resale.
17
FLASH SYNCHRONIZATION
The Pentax ES as FP and X terminals at the front of the
camera body, and an additional X contact on the built-
in hot shoe atop the pentaprism housing, As indicated
in the table, set the shutter dial at 1/60 X for
electronic flash, and the flash cord plugged into the X
terminal. Set the shutter dial at 1/60 or faster for FP
class flash bulb, with the cord plugged into the FP
terminal.
Use the hot shoe flash contact when using a shoe-
mount electronic flash like the Pentax Super Lite II
which also has a flash contact on the shoe bracket. In
this case you do not have to plug the flash cord into
the X terminal on the body front.
The hot shoe flash contact turns to "hot" (switched on)
only when you insert a shoe-mount electronic flash. It
remains cold (disconnected) and you never get a shock
even when using an electronic flash with its cord
plugged into the X terminal on the body front.