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I would only be looking to have one large enough for a single night use then charge it up if i plan to go out the next night.
For size wise i am still trying to find out what size to go for.
The diameter of the eyepiece is around 56mm, so quiet large around the middle.
Looking at photos, it looks to me that is where the dew heaters go on an eyepiece, never used one on an eyepiece before so could be wrong there.
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