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Thanks for the reply Bob, I am very new to the photographic side of astronomy, the set up is a 130mm refractor, on a robust but non go-to mount. I have a reducer / flattener that gets the FL down to ~750mm. From what you have said, I think that a guide scope may be best for my current experience [next to nil], given this will also reduce the load on the main image train. But I am interested in any other insights, very much appreciated. Garth
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