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Houghy,
For a guide scope you don't need to go as exocitic as an ED or semi-apo. A basic acromat will be fine. I use a Celestron ST80, which is also sold be many oher brands. Cost me $US90 on Astromart!! Cheap as chips.. Barlow it and you'll be laughing.
Although I should have probably brought an ED or apo cause now I have the desire to do some shots though the 80mm.... Bust for a bare bones guide scope you can't really beat it.
Cheers
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