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Sorry for digressing from main topic regarding secondary mirror question: I asked if there would be a noticeable difference at the eyepiece between a 1/10 wave pv and 1/20 wave pv secondary? The reason I asked this is because when I first put my 14" Dob under the sky I was using a 2.76" MA GSO secondary (1/10 surface wave [claimed]), then I replaced this with a 3.1" MA secondary from Hubble Optics (1/10 wave pv [claimed]). The larger optic selected to allow for focusser being moved towards primary for binoviewing. Anyway I did in the process note an improvement in image quality at the eyepiece so just wanted to know if even further improvement would be noticed if 1/20 or higher spec secondary was used.
Stephen.
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