For image 9 I moved the statue into the center of the frame and selected regular TTL. Now the exposure of the statue is correct (the color is now accurate as well). This shows that even with all of the advancements of how TTL-BL deals with a dark background, regular TTL is still better as long as the subject is centered properly in the frame and occupies about 20% of the frame so the monitor pre-flashes can meter it accurately.
These images prove that moving the focus point does not affect flash metering in either TTL or TTL-BL flash modes. The change in exposure that has been observed in TTL-BL mode when moving focus points is due entirely to the change in focus distance as reported by the D lens.
Contrary to popular belief, Nikon meters (and Canon’s) are calibrated for 12% gray reflectance, according to ANSI standards (ISO 2720:1974). The correction needed if you are metering off a Kodak 18% gray card is ½ of an f-stop.
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