Nikon D800 User Manual (en)

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The Built-in Flash
The built-in flash can be used with CPU lenses with focal lengths of 
24mm (16mm in DX format) to 300mm, although in some cases the flash 
may be unable to entirely light the subject at some ranges or focal 
lengths due to shadows cast by the lens, while lenses that block the 
subject’s view of the red-eye reduction lamp may interfere with red-eye 
reduction. Remove lens hoods to prevent shadows. The flash has a 
minimum range of 0.6 m (2 ft) and can not be used in the macro range of 
macro zoom lenses. The flash may be unable to light the entire subject 
with the following lenses at ranges less than those given below:
Lens
Zoom position
Minimum distance 
without vignetting
DX
AF-S DX Zoom-Nikkor 12–24mm 
f/4G IF-ED
18–24mm
No vignetting
AF-S DX Zoom-Nikkor 17–55mm 
f/2.8G IF-ED 
20mm
1.5 m/4 ft 11 in.
24–55mm
No vignetting
FX
AF-S NIKKOR 16–35mm f/4G ED VR
35mm
1.0 m/3 ft 3 in.
AF-S Zoom-Nikkor 17–35mm f/2.8D 
IF-ED
28mm
1.0 m/3 ft 3 in.
35mm
No vignetting
AF Zoom-Nikkor 18–35mm 
f/3.5–4.5D IF-ED
24mm
1.0 m/3 ft 3 in.
28–35mm
No vignetting
AF Zoom-Nikkor 20–35mm f/2.8D IF
24mm
1.0 m/3 ft 3 in.
28–35mm
No vignetting
AF-S NIKKOR 24–70mm f/2.8G ED
35mm
1.0 m/3 ft 3 in.
50–70mm
No vignetting
AF-S VR Zoom-Nikkor 24–120mm 
f/3.5–5.6G IF-ED
24mm
1.0 m/3 ft 3 in.
28–120mm No vignetting
AF-S NIKKOR 24–120mm f/4G ED VR
28mm
1.0 m/3 ft 3 in.
35–120mm No vignetting
AF-S Zoom-Nikkor 28–70mm f/2.8D 
IF-ED
35mm
1.5 m/4 ft 11 in.
50–70mm
No vignetting
AF-S NIKKOR 28–300mm f/3.5–5.6G 
ED VR
35mm
1.0 m/3 ft 3 in.
50–300mm No vignetting
PC-E NIKKOR 24mm f/3.5D ED *
24mm
1.5 m/4 ft 11 in.
* When not shifted or tilted.