The EC-XT S Small Eyecup from Fujifilm will fit directly onto the viewfinder of the GFX 50S, X-T2, and X-T1 cameras. The eyecup blocks stray light, which creates glare and would make it difficult to see the image, from entering the camera's viewfinder. Compatitable with GFX 50S, X-T2, and X-T1
Price: $18.95 from Camera House