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refractors tend to show the airy disc better apparently
i have only once seen the airy disc and that was when my mirror was perfectly cooled and the seeing was 8 or 9/10.
what that meant was that i could get my camera to image at around 1600x or more.
so what they are saying is correct, having a perfectly cooled mirror, spot on collimation and fantastic seeing mean you can really bump up the magnification and image........
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