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Hole in my Dob's dustcap
Hi,
I was holding the dustcap for my 10" SW Dob the other night and the cap from one of the holders came off, leaving a 2" or so hole in my dustcap. As this looks like it is supposed to come off, what is the purpose? I've done a search and think it may be something to do with either solar viewing or somehow reducing aperature. Is this correct? How could I utilise this feature, if it is a feature?
I'm new to this.
Thanks for any illumination,
Mark
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