The built-in diopter adjustment on the Phase One XF and the Phase One / Mamiya 645 series camera bodies ranges from -2.5 to + 2.5. This diopter is for nearsighted users with an adjustment from -5.0 to -2.0.

This diopter is suitable for the following cameras:
— Phase One XF Prism Viewfinder, 645DF+, 645DF and 645AF
— Mamiya 645DF+, 645DF and 645AFD I, II & III

There are three additional diopters (available separately) which provide increased dioptric adjustment of ranges from -5 to +2 and which fit in the viewfinder of the Phase One XF and the Phase One / Mamiya 645 series cameras.

Diopter correction lens :        Range of Adjustment
DE401 (standard)                   -2.5 to +2.5.  (70277000)
DE402 (nearsighted users)    -5.0 to -2.0   (70278000)
DE403 (farsighted users)       0 to +3.0       (70279000)