Size 13 is Compatible with - Maven CS.1A/CS.1S, Athlon Ares G2 UHD 15-45X65 Requires the Snapcase - Magnetic digiscoping technology instantly connects Spotter Adapter to Snapcase (sold separately) no more missed shots from alignment issues or complex mounting setups Always Ready in the Field - The low-profile compression fit on the spotting scope eyepiece lets you leave the adapter on at all times, while still allowing you to use the scope normally with your eye Built for Rugged Adventures - The adjustable tether provides additional security during long-range hunting observations, protective cap keeps your spotter clean no matter the outdoor conditions Connect, Capture, and Conquer - Transform your hunting and wildlife observation with the OLLIN Snapshot system, capture trophy animals and outdoor moments with unparalleled ease and image quality Transform your spotting scope into a powerful digiscoping platform with the OLLIN Snapshot Spotter Adapter, featuring innovative magnetic auto-centering technology that instantly aligns your smartphone camera with your optics for perfect shots every time. Made from durable, field-ready ABS plastic with a low-profile compression-fit design, this adapter works seamlessly with any Snapshot Snapcase (sold separately) and is compatible with major brands including Swarovski, Vortex, Leupold, and Kowa. Perfect for hunters, wildlife photographers, and birdwatchers, the system allows you to transition from spotting to capturing in seconds, while the included magnetic protective cap ensures your equipment stays protected and ready to document nature's most magnificent moments.