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The longer the focal ratio the less a reflector needs collomating. A well made F10 Newtonian may never need collomating after it's initial adjustment. I have a 300mm F5 Dob and I collomate it every time I use it. It only takes a few minutes and it guarentees the best possible image my telescope can deliver.
Last edited by mickoking; 30-05-2006 at 08:42 PM.
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