At the time I bought the camera I was in touch with people from QHY and they told me that there is no way to attach a RF lens to the QHY600, maybe this has changed in the mean time, you have to check this with QHY.

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Avalon EvoZero Mount
QHYCCD600C@Sigma 135mm, f/2.8
QHY-5LII@WilliamOptions 50mm GuideScope
Pegasus FocusCube2, Pegasus PowerBox v2

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