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

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The Setup Menu: Camera Setup
3
Acquire Image Dust Off reference data.
Press the shutter-release button the rest of the way down to 
acquire Image Dust Off reference data. The monitor turns off 
when the shutter-release button is pressed.
If the reference object is too bright or 
too dark, the camera may be unable 
to acquire Image Dust Off reference 
data and the message shown at right 
will be displayed. Choose another 
reference object and repeat the 
process from Step 1.
D
Image Dust Off Reference Data
The same reference data can be used for 
photographs taken with different lenses or 
at different apertures. Reference images can 
not be viewed using computer imaging 
software. A grid pattern is displayed when 
reference images are viewed on the camera.