Hasselblad Focusing Screen Adapter 41050 Acute Matte (903,SWC' S)
Designed exclusively for the 903SWC and all previous models of the SWC for checking on picture composition and depth-of-field. Attaches to the camera in the same way as a film magazine. Stray light shading and magnification of the image is available by attaching a magnifying hood, prism viewfinder or reflex viewfinder. Can also be used for TTL exposure metering with PME 3/PME 5/PME 51 finders.