Nikon D6 Reference Manual page 1155

Flash
Flash control
Flash mode
Flash
compensation
Flash-ready
indicator
Accessory
shoe
Nikon
Creative
Lighting
System (CLS)
Sync terminal ISO 519 sync terminal with locking thread
TTL flash control using RGB sensor with
approximately 180K (180,000) pixels: i-TTL flash
control; i-TTL balanced fill-flash for digital SLR is used
with matrix, center-weighted, and highlight-weighted
metering, standard i-TTL fill-flash for digital SLR with
spot metering
Front-curtain sync, red-eye reduction, slow sync, red-
eye reduction with slow sync, rear-curtain sync, off
–3 – +1 EV (choose from step sizes of
Lights when optional flash unit is fully charged; flashes
after flash is fired at full output
ISO 518 hot-shoe with sync and data contacts and
safety lock
i-TTL flash control, radio-controlled Advanced Wireless
Lighting, optical Advanced Wireless Lighting, modeling
illumination, FV lock, Color Information
Communication, auto FP high-speed sync, AF-assist for
multi-area AF (viewfinder photography), unified flash
control
1 1
/ , / and 1 EV)
3 2
Specifications
1103