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The Right Flattener

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Looking Up

Looking Up

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Hi All, I'm getting an Astro Professional 130mm, 900mm f6.9 frac and want to use it mainly for imaging but I am in two minds as to what flattener to use! The scope has a 3 inch focuser so I could use the WP FLT but would I be wasting aperture, I use a 40D, is a better choice the AFR-IV with it's smaller image circle? I don't quite understand if I would utilise the full aperture in any case! Is there another flattener with an aps sensor image circle illumination that is better? Thanks Spencer

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