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Hi JP,
You're using an 8" newtonian - correct? Since the ones bundled with the HEQ5 are designed for imaging, you will most likely reach prime focus, so you won't need to use a Barlow Lens. A Barlow Lens slows down your imaging time as well (e.g. f/10 is 4x slower than f/5 - you can compare the squares). At the moment you just need a T-Ring and T-Adapter, and later on you'll probably want to get a coma corrector and autoguiding.
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