Rotating Eyepiece Phone Adapter Bracket

This compact, mechanically robust adapter bridges smartphone cameras with monocular and binocular eyepieces for astronomy, birdwatching, and landscape documentation. Its spiral line fixation system anchors the eyepiece firmly at the light outlet hole—maintaining coaxial alignment critical for clean image transfer. The rotating horizontal button adjusts the phone cradle width from 55 mm to 98 mm, fitting most modern smartphones including iPhone 14/15 series and Samsung Galaxy S23/S24 models. The eyepiece interface rotates smoothly and accepts outer diameters from 26.4 mm to 46.4 mm, matching common astronomical monocular barrels and many roof-prism binocular eyepieces. A dedicated fixing knob locks the main handle angle, while an independent adjusting handle enables precise longitudinal lens positioning relative to the eyepiece exit pupil. The phone card slot features a calibrated horizontal adjustment knob for consistent, repeatable clamping pressure—ideal for users who frequently switch devices or share equipment.