The JJC ES-EP19 Camera Eyecup is specially designed for Sony a7S III. Made of high quality silicone rubber, its exterior is flexible and has strong abrasion-resistance. During shooting, this eyepiece can not only keep your viewfinder safe from impact and scratches but also protect the viewfinder from dirt, moisture, dust, and unwanted light, thus providing more image details. In addition, it allows more comfortable viewing when camera is held to eye, especially when wearing glasses. And it also protects your glasses from scratches.