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CS-M42 Adapter
This CS-M42 adapter mounts a CS-mount lens on a camera with an M42x0.75mm (T2) female front thread: its male M42 thread screws into the camera and the lens threads into its female CS-mount thread. Designed for Player One planetary cameras, it lets you fit a CS lens for wide-field or all-sky imaging.
Fit a CS-Mount Lens to Your T2-Thread Camera
Many compact wide-angle and fisheye lenses, particularly those made for industrial or security cameras, use the CS-mount standard. It gives an M42 (T2) camera a female CS-mount thread, so CS lenses such as the Player One 2.1mm and 2.5mm all-sky lenses can be fitted.
All-Sky and Wide-Field Imaging
With a short focal length CS lens fitted, such as the Player One 2.1mm or 2.5mm lens, your planetary or guide camera can record a wide or all-sky field for meteor, aurora and cloud monitoring.
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What is the primary function of the CS-M42 adapter?
The CS-M42 adapter connects a CS-mount lens to a camera with an M42x0.75mm (T2) female front thread. Its male M42 thread screws into the camera and the lens threads into its female CS-mount thread, for all-sky or wide-field use.
Can I use a C-mount lens with this CS-M42 adapter?
Yes, with a 5mm spacer. C-mount and CS-mount have the same thread diameter and pitch but different flange-to-sensor distances (17.526mm for C-mount, 12.526mm for CS-mount), so a C-mount lens needs the Player One CS-C 5mm Adapter between it and the CS-M42 adapter to reach focus.
Which cameras is the CS-M42 adapter designed for?
Player One designed it for its planetary cameras, which have an M42x0.75 female front thread. With a CS lens fitted, the camera becomes a wide-field or all-sky camera; for imaging through a telescope you remove the adapter.
Will the CS-M42 adapter allow me to attach my camera to a telescope focuser?
No. Its male T2 thread screws into the camera, leaving only a female CS-mount thread for a lens. To use the camera on a telescope, remove the adapter and fit the camera's 1.25" nosepiece or another M42 accessory.
Does this adapter add significant length to the optical path?
The CS-M42 adapter is 6.5mm long. Because it holds a CS lens rather than sitting in a telescope imaging train, its length does not enter a focal reducer or off-axis guider back-focus calculation.
What types of lenses use a CS-mount?
CS-mount lenses are common on security, industrial and all-sky cameras, including short focal length fisheye lenses. The CS-M42 adapter lets you use them on an astronomy camera with an M42 front thread.
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| Female Thread |
CS-Mount |
| Male Thread |
M42x0.75mm (T2-Thread) |
| Kind |
Lens adapter |
| Optical length (added light path) |
6.5 mm |
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