Accessory shoe – Nikon F4 User Manual
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Located at the top of the Multi-Meter Finder DP-20, the ISO-
type hot shoe allows direct mounting of a wide range of Nikon
dedicated electronic speedlights, including SB-24, SB-23,
SB-22, SB-20, SB-18, SB-16B and SB-15, Other Nikon speed-
lights may be mounted with a compatible Nikon flash unit
coupler. Four electrical contacts in the shoe provide the follow
ing when used with a compatible Nikon speedlight: proper
synchronization of the flash unit, automatic flash output stop,
identification of a TTL flash unit, and both viewfinder ready-light
indication and automatic switching to the proper sync speeds
with Nikon dedicated speedlight units.