Adjusting The Viewfinder Diopter - Pentax 645NII Operating Manual

Adjusting the Viewfinder Diopter

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• The diopter adjustment range is +1.0D to -3.5
m
(per meter).
Aim the camera at a bright subject. While looking
through the viewfinder, turn the diopter adjustment
ring to the left or right until the autofocus frame
l appears in the sharpest focus.