Compatibility For SONY a7R V, a7 IV, a7S III and a1 The JJC ES-A7M4 Camera Eyecup is specially designed for SON. a7R V, a7 IV, a7S III and a1, replaces SON. FDA-EP19 eyecup. It is an upgraded version of the original eyecup for improved viewfinder optics. With an extension of 21.9mm, this eyecup reduces the contact from nose to the LCD screen. 360 rotatable design allows for rotating easily to shoot with either eye or to switch between landscape and portrait orientation. Ergonomic oval shape comfortably fits your eyes to camera. Made of premium silicone material, the eyecup is with good softness, strong abrasion-resistance and provides years of reliable use. Its self-locking mounting system offers easy and secure mount to the cameras viewfinder. It helps to protect your viewfinder from dust, moisture, and scratches and works great for sealing out stray lights and studio lights. In addition, the use of eyecup doesnt affect the normal use of the LCD screen. All our products have undergone multiple inspections to ensure their quality. It is worthy of your trust.