- Versatile Compatibility: This smartphone adapter holder fits eyepieces with an outer diameter of 28mm to 47mm, making it ideal for a variety of optical devices including binoculars, monoculars, astronomical telescopes, bird watching binoculars, and microscope eyepieces. - Universal Smartphone Fit: Designed to accommodate a wide range of smartphones, the adapter bracket adjusts from 54mm to 90mm in width, ensuring compatibility with over 98% of mobile phone brands and models. - Perfect for Outdoor Enthusiasts: Whether you're bird watching, observing wildlife, enjoying floral displays, whale watching, stargazing, or engaging in photography, this cell phone adapter mount enhances your experience by allowing you to capture high-quality images and videos. - Sturdy and Protective Design: The surfaces in contact with your phone and eyepieces are lined with soft EVA material, preventing scratches and damage while providing a stable mount. Additionally, the adapter features a screw port for tripod connectivity, enhancing stability during use. - Practical Use Scenarios: - Capture stunning images of birds in their natural habitat with your smartphone attached to binoculars. - Document celestial events during stargazing by mounting your phone to a telescope. - Enhance your floral photography by using the adapter with a microscope eyepiece to get closer shots. This adapter holder combines functionality, compatibility, and durability to meet the needs of outdoor enthusiasts and photographers alike.