645 Mask for RB67 Focusing Screen

thingiverse

NOTE: New version uploaded on 2/8/2021. Revised to show correct image area (with ~1mm safety margin all around) and included landscape and portrait orientation. This is a 645 mask for the RB67. You'll have to remove the waist level finder and then insert this right on top of the focusing screen. Depending on the tolerances of your printer, it may be a light friction fit or potentially a drop in. Don't force it if it won't go down. Sand if needed. It's intended to help with masking the focusing screen so it's easier to see what will be in frame when you're shooting. Works in both landscape and portrait orientations. Have fun!