PhaseOne P 65+ - Page 76

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Mounting or dismounting the focusing screen
The image area of the P 65+ matches the Contax image area, and
thereby the viewnder area, this means you do not need a viewnder
mask.
If a mask is already attached in the body, remove the mask according
to the relevant users guide.
This viewnder mask has to be mounted underneath the CONTAX
focusing screen.
Refer to the CONTAX 645 Instruction Manual “Replacing Focusing
Screen” before the focusing screen is dis-mounted.