Precision Eyepiece Alignment Phone Bracket

This engineered bracket prioritises optical fidelity and mechanical repeatability when attaching smartphones to monoculars and binoculars. Its defining feature is spiral line fixation that centres the eyepiece precisely at the light outlet hole—establishing a stable, coaxial connection essential for high-fidelity imaging. Mobile phone width adjustment (55–98 mm) is achieved via a rotating horizontal button with positive stop feedback. Both the eyepiece and smartphone lens interfaces rotate independently and accept diameters from 26.4 mm to 46.4 mm—matching widely available UK-sourced optics and current-generation phones. A dedicated fixing knob locks the handle’s angular orientation, while a separate adjusting handle provides controlled longitudinal lens displacement. The phone card slot uses a horizontal adjustment knob to apply uniform clamping pressure—ensuring secure hold across varying phone profiles and minor manufacturing tolerances.