Amazon.com : SOLOMARK Universal Upgrade Cell Phone Adapter Mount, Quick Aligned Smartphone Digiscoping Adapter for Monocular Binoculars Spotting Scope,Spring Type Stretchable Clip for All Brands of Smartphone : Electronics
GOSKY Smartphone Adapter Mount Regular Size - Compatible with Binoculars, Monoculars, Spotting Scopes, Telescope, Microscopes - Fits almost all Smartphones on the Market - Record Nature and The World Standard
Free STL file Universal Adapter Smartphone-Binoculars 📱・Template to download and 3D print・Cults
Celestron Basic Smartphone Adapter, 1.25” - Space Arcade