Carl, I got the Skywatcher autofocuser for Christmas and while I haven't used it yet in anger I have set it up though and it looks like it'll do the job I need. It does say it supports the ED models so you should be right but if you decide to get one I'd double check.
It's simple to set up and easy too control too so it's worth considering.
With my 150PL on the eq3-2 the shake is terrible for manual focus so this will get rid of the need to touch the thing. Especially useful when using the webcam.
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