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My big scope (ED150), resides in a dry room in my house, as have all my previous scopes except my 16" Dob. The dry room has a couple of the large dessicant canisters from Bunnings. The scope normally resides in it Geoptik bag, which is left open.
I have in the past used various dessicant products designed for scopes (which basically means they are expensive), including the Farpoint focuser inserts that are suppose to dehumidify the interior of the tube. I find nothing is better than having a dry room, obviously you need to have the room for that.
PS I have an observatory, and ran a dehumidifier in there for several years, but it's just not very effective, the dry room works much better imho.
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