I have a D5600 w/SB-800 speedlight. The two images attached I shot with a Tamron 24-70 f/2.8 lens. The pictures have not been modified in anyway. Both pictures were taken in aperture priority mode. The brighter of the two photos was taken at f/2.8, 1/60 (automatically determined by the camera because I'm using a flash) and ISO100. The darker photo was taken at f/16, 1/60 (again, automatically determined by the camera) and ISO100. Speedlight was angled back over my head and bouncing off the wall behind me and it was set to TTL/BL, AF-illuminator is turned on. Shouldn't the flash compensate for the underexposure found in the second photo? Same thing happens when I shoot in manual mode with my shutter at 1/200.
Am I missing something crucial when shooting iTTL?
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