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If you rack out the focuser and the image gets closer to being focused without quite making it, you may need an extension tube for your focuser. Should be inexpensive. If for some reason it gets closer to focus the further in the focuser is racked, then you may have problems.
Or sometimes rather than an extension tube you can just have the eyepiece fitted a little further out of the focuser, but you don’t want to risk the EP falling out, particularly a 31T5.
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