FujiFilm X-T2 Owner's Manual page 176

Peripheral Illumination Correction
Choose from values between –5
and +5. Choosing positive values
increases peripheral illumination,
while choosing negative values
reduces peripheral illumination.
Positive values are recommended for vintage lenses,
negative values to create the eff ect of images taken
with an antique lens or a pinhole camera.
N
To determine the amount required, adjust peripheral il-
lumination correction while taking photos of blue sky or
a sheet of gray paper.
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