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KevinOBrien

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  1. KevinOBrien
    If I made a mask with two holes, would it give me split image focus confirmation?
  2. KevinOBrien
    I have a 10 inch collapsible skywatcher dobsonian and the hole in the cover works just fine as an aperture mask in its customary position, between the primary and secondary reflectors. Here's a shot I took yesterday.
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