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EBXL5

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    Hole on Scope Cap?

    in Getting Started With Observing

    Posted

    It's for viewing with a reduced aperture, set off-centre because the secondary would block it if the hole were in the middle. Usually used for solar viewing (with safe solar filter over the hole). The other raised part is just to make it all look symmetrical.

    The other raised part on the telescope blanking cap is usually for putting the smaller cap on so you don't lose it. Handy huh.

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