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This is a TTL auto flash mode to be found on newer flashguns such as the SB-5000, SB-910, SB-900, SB-800, SB-700, SB-600, SB-500, SB-400, SB-300, SB-N7. It is more accurate than the former D-TTL mode, thanks to stronger pre-flashes with shorter duration.

The flash sensor in the camera monitors the preflashes that are fired off and the subject should typically be correctly exposed independent of ambient light. Later a real issue bothering regular TTL modes.

This means that iTTL, and D-TTL, are incompatible with manual mode flashes, or with flashes operating in manual mode, and is incompatible with optical slave triggers for manual mode. Because:

  • iTTL flash (all digital camera auto flash) fires a pre-flash before shutter is open, which the camera meters
  • Sets the power level of the flash to be correct exposure
  • Opens shutter and triggers the flash

Technically, all auto digital camera flash fires this preflash. iTTL is just Nikons name for their system.

See also

Nikonians Photo Glossary

  • This page was last modified on 13 February 2021, at 07:14.
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