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10.2 About Viewfinder Masks
The image area of the Phase One & Mamiya 645 is approximately
56 mm x 42 mm.
The light sensitive CCD in the P 65+ measures 53.9x40.4 mm, this
means that viewer masking is not necessary, hence is the lens factor
now 1.0.
If a mask is already attached in the body, remove the mask according
to the relevant users guide.