The Standard Phone Adapter by Novagrade provides a high quality digiscoping experience. This adapter will is compatible with any round eyepiece between 39mm to 60.75mm, but compression rings for eyepieces smaller than 39mm are also available by clicking here. The Standard Phone Adapter will fit phones and mini-tablets up to 4 3/8” wide with or without a protective case and can be easily adjusted. Novagrade Standard Phone Adapter PA-0200-01