1.25" C/CS Webcam & Video Adapter
Connects a C- or CS-mount webcam or video camera to your telescope for prime-focus imaging — a low-cost path into lunar, planetary, and live-video astronomy.
This 1.25" nosepiece-to-C/CS-mount male adapter drops into any 1.25" focuser or diagonal and presents a male C/CS thread (1" × 32 tpi) on the camera side. It connects C- or CS-mount webcams, video cameras, and security-type cameras directly to the telescope for prime-focus imaging, with the scope itself acting as the lens. C/CS-mount cameras are a popular, affordable way to start capturing the Moon and planets — their small sensors and high frame rates suit lucky-imaging of bright targets, where you stack the sharpest frames from a video clip into a single detailed image.
Specifications
Telescope side
1.25" nosepiece — inserts into any 1.25" focuser or diagonal
Camera side
Male C/CS thread (1" × 32 tpi)
Filter threads
1.25" — on the nosepiece
Compatible cameras
C- or CS-mount webcams, video, and security cameras (female C/CS thread)
Not compatible
Fixed-lens, bayonet-mount, or non-C/CS cameras
How it connects
Telescope / diagonal → 1.25" C/CS adapter → C- or CS-mount webcam / video camera
What it works with: any camera that has a female C or CS thread — standard on machine-vision webcams, planetary cameras, and many video and security cameras. It will not work with cameras that have a fixed lens, a bayonet mount, or no C/CS female thread.
Nail focus on your first shots: stars and planets are unforgiving — even a tiny focus error softens the whole frame. A Bahtinov mask makes focusing almost foolproof, turning a bright star into a clear diffraction pattern you center by eye. Choose the focus mask sized to your telescope and your first captures come out sharp.
Frequently Asked Questions
What is a C/CS mount?
C-mount and CS-mount are a common 1" × 32 tpi threaded lens standard used by machine-vision webcams, planetary cameras, and many video and security cameras. This adapter presents the male C/CS thread so those cameras screw directly onto your telescope.
Which cameras will work with this adapter?
Any camera with a female C or CS thread — common on planetary/webcam-style imagers and video cameras. It will not work with cameras that have a fixed (non-removable) lens, a bayonet lens mount, or no C/CS thread. For a DSLR or mirrorless body, use a T-thread prime focus adapter instead.
Will this work with my telescope?
Yes, as long as your telescope or diagonal accepts a 1.25" accessory and your focuser has enough in-travel to reach focus with a camera attached. C/CS cameras are especially well suited to lunar and planetary imaging.
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