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Bintel sell the DFK's, Mark. I think telescopes-astronomy do as well.
You don't *need* an electric focuser. It always helps, but it's not absolutely essential.
It's obviously helpful for 2 reasons:
1. You don't need to touch the scope, so you don't wobble the scope and make the image bounce around
2. It's more accurate because you can move it in tiny increments.
I just use a cheap Orion Accufocus on my 12" dob.
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