Amazon.com: Gosky Microscope Lens Adapter, Microscope Smartphone Camera Adaptor - for Microscope Eyepiece Tube 23.2mm, Built-in WF 16mm Eyepiece - Capture and Record The Beauty in The Micro World : Cell Phones
Z-Prime Universal Macro Lens with Free Adapter - Ztylus
Universal 10X Mobile Cell Phone Adapter for Microscope Eyepiece | Boli Optics Microscope Store
Ulanzi 67mm Filter Bracket Holder for Phone Camera Lens Filter Adapter Ring Video Rig Lens Adapter Holder for iPhone 14 Series
Amazon.com: SESENPRO Universal Smartphone Clamp, Phone Tripod Mount Adapter with Cold Shoe Mount, Mini Tripod, Equipped with Cell Phone Lens Mounting Hole for 14mm Srew Hole Phone Lens, for Most Smartphone :
Adapter lets you mount SLR lenses on iPhone
Ulanzi DOF Adapter for 17mm Ulanzi Smartphone Case System - Walmart.com