Nikon D750 Product Manual - Page 377
Optional flash, Built-in flash, Group A, Choose a flash mode for all flash units in group A.
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Option Built-in flash TTL M -- Group A TTL AA M -- Group B Channel Description Choose a flash mode for the built-in flash (commander flash). When an optional SB-500 flash unit is attached, this option changes to Optional flash and is used to choose a flash mode for the SB-500. Otherwise this option is identical to Built-in flash. i-TTL mode. Choose flash compensation from values between +3.0 and -3.0 EV in increments of 1/3 EV. Choose the flash level. The built-in flash does not fire, although remote flash units do. The built-in flash must be raised so that it can emit monitor pre-flashes. Choose a flash mode for all flash units in group A. i-TTL mode. Choose flash compensation from values between +3.0 and -3.0 EV in increments of 1/3 EV. Auto aperture (available only with compatible flash units; 0 435). Choose flash compensation from values between +3.0 and -3.0 EV in increments of 1/3 EV. Choose the flash level. The flash units in this group do not fire. Choose a flash mode for all flash units in group B. The options available are the same as those listed for Group A, above. Choose from channels 1-4. All flash units in both groups must be set to the same channel. 349
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