1.25 inch to C Mount C-Mount Adapter Extinction Inner Thread Adapter Converter Connect Astronomical Telescope with C CS CCD Industrial USB Camera Specification Top Outside Mount Thread: C/CS mount (25.4 mm)
External thread: M25*0.75mm
External thread depth: 5mm
Internal thread: M28.6*0.6mm
Internal thread depth: 6mm
Flange spacing: 2mm
Clear aperture: 21mm
Bottom Outer Diameter: 1.25 inches (31.7 mm)
Material: aluminum alloy
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