STEP1-Cover the lens cap or the CMOS dust cover.
STEP2-Turn off the camera, and uncheck the options for enabling dark field correction and bright field correction.
STEP3-Click on "Set Dark Field" and then click "OK".
STEP4-After the prompt indicates that the dark field setting is successful, check the options for enabling dark field correction and bright field correction.
STEP5-Click on "Preview" to complete the dark field setting.