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

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The Shooting Menu: Shooting Options
Select On to reduce noise (bright spots, 
randomly-spaced bright pixels, or fog). 
Noise reduction takes effect at all ISO 
sensitivities, but is most noticeable at higher values. The time 
required for processing at shutter speeds slower than about 1 s 
roughly doubles; during processing, “
l m” will flash in the 
viewfinder and photographs can not be taken. Noise reduction 
will not be performed if the camera is turned off before 
processing is complete.
If Off is selected, noise reduction will only be performed as 
required; the amount of noise reduction is less than that 
performed when On is selected.
“Vignetting” is a drop in brightness at the edges of a 
photograph. Vignette control reduces vignetting for type E 
and G lenses (
0 253). Its effects vary from lens to lens and are 
most noticeable at maximum aperture. Choose from High
NormalLow, and Off.
Noise Reduction
G button
➜ C shooting menu
Vignette Control
G button
➜ C shooting menu
A
Vignette Control
Depending on the scene, shooting conditions, and type of lens, JPEG 
images may exhibit noise (fog) or variations in peripheral brightness, 
while preset Picture Controls that have been modified from default 
settings may not produce the desired effect. Take test shots and view 
the results in the monitor. Vignette control does not apply to movies 
(
0 138) or to pictures taken with lenses that support FX format.