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GlennLeDrew
professor emeritus
Reged: 06/18/08
Posts: 620
Loc: Ottawa, Ontario, Canada
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Re: Baader Mark V and fast Newtonians
06/22/08 07:45 PM
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I've done a quick 'n dirty comparison of the cheaper William Optics' (~20mm aperture) and Denkmeier (26mm aperture) bino viewers, and both have similar accommodation as regards steepness of light cone when used "au naturel", or "clean". An f/6 cone can certainly be passed fully, and possibly as fast as f/5.5. Any shorter, and aperture reduction will be the result. Actually, it may seem strange but my impression is that the smaller aperture (cheaper) unit could take in a slightly faster light cone.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
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