Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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308 Technical Notes
❚❚ Using the Built-in Flash
When using the built-in flash, be sure the subject is at a range of 
at least 0.6 m (2 ft) and remove lens hoods to prevent vignetting 
(shadows created where the end of the lens obscures the built-in 
flash).
Shadow
Vignetting
Camera
Zoom position
Minimum distance 
without vignetting
D5500/D5300/D5200/
D3400/D3300
18 mm
1.0 m/3 ft 4 in.
24, 35, 45, and 
55 mm
No vignetting