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Dust cap on dust cap?

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I've just been messing around with my month old telescope (it's cloudy outside!) and I think I've found an extra dust cap on the dust cap, which is removable. The cap is on the top left of the big cap, and it goes into the hollow hole below it.


Is this a common feature on telescopes?

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Yep, it turns your 150mm F/5 scope into a 50mm F/15 scope. Seems to be a Skywatcher / Celestron speciality - I've not seen it on other brands of scope (Skywatcher and Celestron are owned by the same company).

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  • 2 weeks later...

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