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Thanks Alistair.
I have the colour 5LII, bought so I could use it for quick planetary imaging too, so I guess it's not as sensitive as the mono for guiding.
I had thought of using a barlow with the guide scope, that'll probably be the quickest/easiest/cheapest thing to try if I'm not getting good results.
Good to know you can use a reducer with an OAG, I hadn't thought of that.
Thanks for your help Alistair.
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