The SB-800 Flash Instruction Manual (as all the manuals for iTTL capable Nikon speedlights) says that when using the flash in TTL mode, adjusting Camera Compensation will lighten or darken the entire image, which means it must increase or decrease flash power, so I thought I should examine that subject.
Note: The images in this study are directly from a DSLR (a D200 camera) without any modification except compression to make them suitable for uploading.
Image 1: Flash OFF, Camera A mode, 1/25th, f/2.8, Camera EV=0
I shot Image 1 with the flash Off using camera A mode with f/2.8 selected. I could see in the viewfinder that the camera automatically selected 1/25 shutter. Notice that the image is properly exposed with pixels in the histogram extending all the way from black shadows on the left to bright highlights on the right and there are some shadows on the face and is approximately the same brightness as the background. The yellow color is due to the incandescent lighting and the poor Auto White Balance function on the D200. I will not correct or balance the color during this study.
Image 2: Flash On in TTL mode, FEC=0, Camera A mode, 1/60, f/2.8, Camera EV=0
Note: FEC means Flash Exposure Compensation
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