This is a mask for the viewfinder screen of the Hasselblad V system. It is for a sensor size of 44x33. When using a medium format digital back, the shooting range 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 range. The manufacturer's genuine products are difficult to obtain, and some current products cannot be attached to certain bodies, so I made this myself. I realized that I could mass-produce them, so I made them by hand in the hope that they 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. You can either hook it onto the protruding part of the frame on the back of the viewfinder screen, or attach it to the frame with thin double-sided tape. As this is a handmade product, please understand that no returns or exchanges are accepted except for fatal defects or size errors. Typical compatible models include: ・Hasselblad CFV 50C/CFV II 50C/CFV 100C ・Phase One IQ140/150/250/350/P40+/P30+/P21+/P30/P21 ・Leaf Credo 40/ Aptus-II 6,8 etc.