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I tried just putting a normal nosepiece on the front of the camera with an 2" astronomiks ir filter on the end. It worked reasonably well but you would need to seal the filter glass to the filter holder and the nosepiece to the camera to keep air out in the long term.
I believe all these problems where solved in the newer cameras, qhy8 pro, qhy10 etc. Theo would know more about that.
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