This is a finder screen mask for the Hasselblad V system. It is for sensor sizes 48x36 (or 49x37). When using a medium format digital back, the shooting area of the sensor is smaller than the original film size. By inserting this mask under the screen, you can get an idea of the actual shooting area. Since it is difficult to obtain genuine manufacturer products, and some current products cannot be attached to certain bodies, I made this myself. I found that it could be mass-produced, so I made it by hand in the hope that it would be helpful to those who have the same problem. Please note that the material is sensitive to moisture and oil. Please be careful not to get these on it. When attaching the mask, hold it by the edges and try not to get fingerprints on it. The second and subsequent photos are examples of how it is attached. It is designed to be hooked on the protruding part of the frame on the back of the finder screen, or attached to the frame with thin double-sided tape. As this is a handmade product, please understand that it is NCNR (No Claim, No Return) except for fatal defects or size errors. The camera photos are examples of how it is attached. You will receive two finder masks. The attachment method is to hook it on the protruding part of the frame on the back of the finder screen, or attach it to the frame with thin double-sided tape. As this is a handmade product, please understand that it is NCNR (No Claim, No Return) except for fatal defects or size errors. Typical compatible models include: ・Hasselblad CFV-50(CCD)/CFV-39 ・Phase One P45+/P25+/P45/P25/H25 ・Leaf Aptus-II 5/7, etc.