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Gas giant

Circular hole in lens cap?

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Hi

Rookie question...

I have a Skywatcher Explorer 130PS AZ and have just noticed that the main marge lens cap has a circular hole in it with a removable cover, about 5cm in diameter.  I thought the circular gaps were to make it easier to remove when viewing until I accidentally knocked tha cap off. Can someone tell me why there is a hole there?

Thanks!

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