Nikon D750 DSLR Camera (Body Only) - Manual (Page 526)

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The Built-in Flash
The built-in flash has a minimum range of 0.6 m (2 ft) and can not
be used in the macro range of macro zoom lenses. It can be used
with CPU lenses with focal lengths of 24 mm (16 mm in DX
format) to 300 mm, 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. The following
illustrations show the effect of vignetting caused by shadows
cast by the lens when the flash is used.
Remove lens hoods to prevent shadows. The flash may be
unable to light the entire subject with the following lenses at
ranges less than those given below:
Shadow Vignetting
Lens Zoom position
Minimum distance
without vignetting
DX
AF-S DX NIKKOR 10–24mm
f/3.5–4.5G ED
18–24 mm No vignetting
AF-S DX Zoom-Nikkor
12–24mm f/4G IF-ED 18 mm 1.0 m/3 ft 3 in.
20–24 mm No vignetting
AF-S DX Zoom-Nikkor
17–55mm f/2.8G IF-ED 20 mm 2.0 m/6 ft 7 in.
24–55 mm 1.0 m/3 ft 3 in.
AF-S DX NIKKOR 18–200mm
f/3.5–5.6G ED VR II
AF-S DX VR Zoom-Nikkor
18–200mm f/3.5–5.6G IF-ED
18 mm 1.0 m/3 ft 3 in.
24–200 mm No vignetting
AF-S DX NIKKOR 18–300mm
f/3.5–5.6G ED VR 28 mm 1.0 m/3 ft 3 in.
50–300 mm No vignetting