Nikon Z 7 Reference Manual page 324

3
Acquire 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 a message will be displayed.
Choose another reference object and
repeat the process from Step 1.
D
Image Sensor Cleaning
Dust off reference data recorded before image sensor cleaning is
performed cannot be used with photographs taken after image sensor
cleaning is performed. Select Clean sensor and then start only if the
dust off reference data will not be used with existing photographs.
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
cannot be viewed using computer imaging
software. A grid pattern is displayed when
reference images are viewed on the camera.
300 Menu Guide > B The Setup Menu