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ZWO M42 Plate for CAA Rotator
The ZWO CAA M42 Adapter Plate directly converts the native M48 or M54 thread of the ZWO Camera Angle Adjuster (CAA) to a male M42x0.75 T-thread. This zero-profile plate replaces the rotator's stock adapter, enabling a direct connection to M42-threaded cameras and accessories while preserving the critical 55mm backfocus distance required by most imaging systems.
Achieve Precise 55mm Backfocus with M42 Cameras
For imagers using popular cameras like the ASI533 or ASI2600 series, which often rely on M42 spacers to achieve the standard 55mm backfocus, this adapter is essential. Instead of adding a separate M48-to-M42 step-down ring, this plate creates a single, rigid M42 connection point on the CAA itself. The result is a mechanically simpler and more stable imaging train that meets the 55mm specification without compromise.
Direct 6-Screw Installation
Swapping the adapter plate on your ZWO CAA is a straightforward mechanical task. The plate installs using the same six mounting screws as the original M48/M54 plate, ensuring perfect alignment and a secure fit.
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Remove Stock Plate: Use the hex wrench included with your ZWO CAA to undo the six screws holding the existing adapter plate.
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Install M42 Plate: Place the CAA M42 Adapter Plate onto the rotator body, aligning the six screw holes.
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Secure and Image: Reinstall the six screws to lock the plate in place. Your CAA is now fully configured for any M42-threaded camera or accessory.
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Does the ZWO CAA M42 Adapter Plate add any backfocus to my imaging train?
No. It replaces the stock connector on the ZWO Camera Angle Adjuster, and ZWO's connection diagrams count the CAA fitted with the M42 adapter as 16.5mm, the same as the CAA itself, so your 55mm back focus plan is unchanged.
Why use this M42 plate instead of a standard M48-to-M42 step-down ring?
This plate replaces the stock M48/M54 connector on the CAA and puts a native M42 thread directly on the rotator, so the train needs one part fewer. ZWO's M42 solutions use it this way within the CAA's 16.5mm.
Is this adapter compatible with the ZWO ASI533MC Pro camera?
Yes, this is the ideal adapter for using a ZWO ASI533MC Pro or ASI533MM Pro with the ZWO CAA. Since those cameras use M42 threads, this plate allows you to connect the camera directly to the rotator as part of a standard 55mm backfocus configuration.
Will this M42 plate work with any brand of camera rotator?
No, this adapter plate is designed specifically for the ZWO Camera Angle Adjuster (CAA). It uses a proprietary 6-screw mounting pattern and is not compatible with rotators from other manufacturers.
What tools are needed to install the ZWO CAA M42 plate?
Installation requires the small hex wrench that was originally included with your ZWO CAA rotator. No other tools are necessary.
Can I use the ZWO CAA M42 plate with an Off-Axis Guider (OAG)?
Yes. If your imaging train is configured for 55mm of backfocus and includes an M42-threaded OAG, this plate allows you to place the ZWO CAA rotator in front of the OAG without altering the required spacing.
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| SKU |
ZWO-CAA-PLATE-M42 |
| Output Thread |
M42x0.75 Male (T2-Thread) |
| Compatibility |
ZWO Camera Angle Adjuster (CAA) |
| Telescope-side connection |
ZWO CAA rotator body (screw-mounted plate) |
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ZWO CAA M42 Adapter Plate
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- ZWO 2-Year Limited Warranty
