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Model: zwo_m42-m48-16.5mmPart Number: M42-M48-16.5MM
ZWO M42-M48 extender with 16.5mm length.
This spacer is excellent quality and serves its purpose well to help gain back focus fir my ZWO camera.
All good. I used it to connects Skywatcher reducer to required spacers to provide correct backfocus. Threads were smooth (no snagging etc) - good quality.
The extender that i need to make the 55mm backfous for my qyh163M (camera) + Qhycfw2-s (filter wheel).