What is the thread size of the M42M Camera Metal Cover?
The M42M Camera Metal Cover features standard male M42 x 0.75 threads. This is commonly referred to as a "T-thread" or "T2-thread" and is the most common interface on astronomy cameras, filter wheels, and off-axis guiders.
Will the M42M Camera Metal Cover fit my ZWO, QHY, or Player One camera?
Yes, this cover will fit almost any dedicated astronomy camera that has female M42 T-threads. Typically, you would remove the 1.25" or 2" nosepiece to expose these threads on the camera body, and the M42M cover will thread directly on to seal the opening.
Why should I use the M42M Camera Metal Cover instead of the plastic cap that came with my camera?
A metal cover offers significantly better protection. Key advantages include:
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Durability: It will not crack or break if dropped or bumped.
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Secure Fit: Metal threads provide a tighter, more positive seal that is less likely to come loose during transport.
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Contamination: Unlike some plastics, metal does not outgas or shed particles that could settle on your sensor.
Can I use the M42M Camera Metal Cover on my filter wheel?
Absolutely. If your filter wheel or off-axis guider has an open female M42 T-thread port, this cover is the perfect way to seal it against dust when it's not connected to your telescope or camera. This protects both your filters and the internal mechanisms.
How does the M42M Camera Metal Cover protect my camera when storing it in a dusty garage?
The M42M Camera Metal Cover creates a much tighter seal than a simple plastic push-in cap. By threading securely into the camera body, it forms a robust barrier that prevents fine dust particles and airborne moisture from reaching the sensor and optical window, keeping your imaging train clean even in challenging storage environments.
After removing the 1.25" nosepiece from my ASI120MM, is the M42M Camera Metal Cover the right part to use?
Yes, it is the exact part you need. Once the 1.25" nosepiece is unthreaded from a camera like the ZWO ASI120MM, it exposes the female M42 T-threads on the camera body. The male threads on the M42M Camera Metal Cover will screw directly into that port for a secure, protective seal.
