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CS-1.25 Adapter
The CS-1.25 adapter connects any CS-mount lens to a camera with a 1.25" nosepiece or standard M28.5x0.6mm filter threads, making it an essential tool for creating a compact, wide-field guide scope. This simple adapter unlocks the potential of using small, lightweight, and often fast C-mount lenses for autoguiding or electronic finder applications.
Convert Your Guide Camera into a Wide-Field Scope with a 1.25" Adapter
This adapter is designed for one specific, critical task: bridging the gap between the CS lens standard and the 1.25" format common to most astronomy guide cameras. By threading directly into the camera body or nosepiece, it allows you to attach a wide variety of affordable and compact CS-mount lenses, instantly converting your guider into a standalone, wide-field imaging system.
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Female Thread (Lens Side): Accepts any standard CS-mount lens, popular in security and machine vision applications.
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Male Thread (Camera Side): Features M28.5x0.6mm threads, which is the standard for 1.25" astronomy filters. This allows it to screw into the filter threads found inside most 1.25" camera nosepieces.
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Primary Use Case: Build a lightweight, wide-field guide scope. This is particularly useful for portable setups or for guiding on short focal length imaging telescopes where a traditional guide scope would be overkill.
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What is the primary function of the CS-1.25 adapter?
The CS-1.25 adapter is designed to connect a lens with a CS-mount thread to an astronomy camera that has a 1.25" nosepiece or accepts standard M28.5x0.6mm filter threads. This allows you to use widely available CS lenses as a compact guide scope or an all-sky camera.
How do I attach the CS-1.25 adapter to my guide camera?
You typically unscrew the 1.25" barrel that comes with your guide camera. The adapter's male M28.5x0.6mm threads will then screw directly into the camera's body where the barrel was attached. Once the adapter is secure, you can thread your CS-mount lens onto the adapter's female threads.
Will this CS-1.25 adapter work with C-mount lenses?
No, this adapter is specifically for CS-mount lenses. While C-mount and CS-mount have the same thread diameter, they have different flange-to-sensor distances. A C-mount lens requires a longer distance and will not reach focus when attached to this CS-mount adapter.
Can I use the CS-1.25 adapter to create a guide scope for imaging the North America Nebula (NGC 7000)?
Yes, absolutely. Pairing a short focal length CS lens (e.g., 12mm or 16mm) with your guide camera using this adapter is an excellent way to get a very wide field of view. This makes it easy to find multiple guide stars when imaging large deep-sky objects like the North America Nebula (NGC 7000) or the Andromeda Galaxy (M31).
What are the exact thread specifications for the CS-1.25 adapter?
The adapter has two threads:
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Female Thread: CS-mount
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Male Thread: M28.5 x 0.6mm (This is the standard thread size for 1.25" filters)
Is the CS-1.25 adapter compatible with Player One or ZWO guide cameras?
Yes, this adapter is compatible with most guide cameras that use a standard 1.25" nosepiece with internal M28.5x0.6mm threads, which includes the vast majority of models from brands like Player One and ZWO.
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| Female Thread |
CS-Mount |
| Male Thread |
M28.5 x 0.6mm (1.25" Filter Thread) |
| Application |
Connects CS lenses to 1.25" astronomy cameras |
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Player One 2-Year Warranty
