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Hi all...just a thought..with my Dob..I do store it horizontal..but...since the focuser is set on an upward angle..so is the secondary mirror..so I place it on it's mount..(back-to-front if you like)...so that the focuser points downwards when it's horiziontal..plus..a bag of silica gel taped to the sipder vane where it joins onto the inside of the tube helps to control moisture..cover the lot with a clean cotton sheet.
You could also use a bag of silica gel taped on the inside of the dust cap for the focuser on SCT's to prevent moisture build-up or mould on the optics.
Cheers!!
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