This is a replacement Mamiya Focusing Screen SD402 Checker screen for the Mamiya 645 AF camera. This focusing screen is useful when shooting architecture, art work or any other scenario where proper alignment of vertical and horizontal lines is required.
Mamiya offers three interchangeable screens for the 645AFD camera
Checker SD 402 - Same as Matte, but with perpendicular grid. The grid pattern is ideal as a compositional aid. Grid intersections also useful as reference points for multiple exposures
Matte SA402 - All matte with Fresnel lens, suited for general-purpose photography
Microprism Type C - for Non-AF 645 Lenses - Same as Matte, but with central microprism spot added. Provides an alternative Rangefinder Spot screen for enhanced focusing precision with the manual focus lenses. When using the manual focus lenses in the stop down metering mode, this screen must be used