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Nikon TTL BL flash can use the D lens Distance
to Override Overexposure on Direct Flash


This is same setup, repeated with a D800. Same result, description and comments on previous page.


The pictures below: Nikon D800, f/8 1/125 second, ISO 100. 70-200mm D lens. SB-800 hot shoe direct flash, five feet. No compensation, all point and shoot, except the distance was measured for the GN mode. The only adjustment is white balance. The backgrounds are black and white paper.

Again, this is not about theoretical perfect exposure, as there was no attempt here to compensate anything.

GN Mode
TTL BL Mode
TTL Mode
D lens distance info did significantly minimize the TTL BL expected overexposure of the black scene, but a bit less so, more middle ground between the overexposed TTL and the GN distance exposed version. There was substantial modification, but not quite equal to GN mode.
Error in measuring the actual distance can vary the GN results, which may be the difference. But it was measured, and the D lens information in the Exif says subject distance of both groups on both pages was 1.5 meters (4.92 feet), so the two groups were very similar.

GN Mode
TTL BL Mode
TTL Mode
D lens distance info obviously DID NOT affect the TTL BL expected underexposure of the white scene.
The TTL BL result is again slightly more underexposed than the TTL metered version here.

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