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You can get hold of adapter rings that are M48 on the outside and M42 on the inside (ie, a step-up (or step-down, depending on the direction you're going) ring).
To confuse you more, my first-generation ZWO filter drawer is female-M48 on one side and male-M42 on the other. So I need an M48/M42 adapter ring to make it all work with my setup.
It's enough to drive you insane - at least until you get it all connected and working!
Cheers,
V
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