Starting in 1989 with the 430EZ Canon has equiped all speedlites with a hot shoe locking pin. All camera bodies since the the EOS 630 have been equiped with hot shoes with locking-pin holes. When a speedlite equiped with a locking pin is mounted on a body with a pin-hole, a fail-safe mate is ensured.

A Canon speedlite with a locking pin can be mounted on a body no so equiped, with the thumb-wheel providing the only security (as with previous speedlite models.)

• The Off Camera Shoe Cord 2 is equiped with a locking pin on the camera side and a pin-hole on the flash side.
• The TTL Hot Shoe Adapter 3 is also equiped with a locking pin on the camera side and a pin-hole on the flash side. The TTL Hot Shoe Adapter 2 is not equiped for locking pins on either side, but otherwise shares the same electronic compatiblility as the HSA-3.
  Return to Canon EOS Speedlites page.