Most hunters use a set of binoculars or a spotting scope to view wildlife and nature. Adapt your smartphone to your optics with a Phone Skope Adapter to take pictures and view distant objects. Smartphone cameras are high quality and give you the ability to capture moments in the field to take home and share with your friends and family. Phone Skope's Universal Optic Adapter is one of two required pieces for the Phone Skope system (phone case sold separately: product family #101913564). The Universal Optic Adapter locks into the Phone Skope Phone Case and features a ratchet-style locking mechanism that adjust to create a solid mount to most optics. SizeU-1 - 1.20-1.90" eyepiece diameterU-2 - 1.70-2.34" eyepiece diameter Note: Please use the Phone Skope Product Selection Guide below to determine which product model will fit your optic.