30-57mmMetal Universal Phone Slit Lamp Telescope Microscope Adapter Holder Mount

Microscope Eyepiece Dia. 23.2mm to 1.25" Adapter Ring for Astronomical Telescope

Microscope Adapter Ring C-mount to 23.2mm 30mm 30.5mm 1.25 Inch to C mount

30-57mmMetal Universal Phone Slit Lamp Telescope Microscope Adapter Holder Mount

Smartphone microscope camera adapter mount for eyepiece viewing

Camera Adapter Thread Ring -M42 Lens Microscope Interface Rings