You can also mount it to the top of the focuser as well. Borrowed the design from Mike (Spartacus). I had it originally mounted to the bottom of the focuser like you'd normally but I found that taking it off and on was a huge pain. When you undo the screws at the bottom, the whole focuser assembly sorta comes off and having to retighten it just right every time was a hassle. This was for the ED100 and ED120 esprits but I'm sure the ED150 would be the same. Just larger. If you don't plan on taking the autofocuser off, than the bottom of the focuser is more stable and rigid.
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