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Before your operation
When it is hard to rotate the diopter-adjustment dial
To focus on a subject quickly using the viewfinder
When you look into the viewfinder, the subject located in the AF area
comes into focus automatically (Eye-Start AF).
MENU button t 1 t [Eye-Start AF] t [On]
When the FDA-A1AM Angle Finder (sold separately) is attached to the
camera, setting [Eye-Start AF] to [Off] is recommended because the
eyepiece sensors located below the viewfinder may be activated.
Put your fingers under the eyecup, and
slide it upward to remove the eyecup,
then adjust the diopter.