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Dr_who Dr_who is offline

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  1. DeadJohn
    05-17-13
    DeadJohn
    I have an SVR-80ED doublet. I think all of Stellarvue's ED scopes are by definition doublets. I bought the doublet for weight and cost considerations; it's a great "grab&go" scope.

    Knowing what I know now, I wish I bought a larger triplet. My astronomy hobby has evolved to more astrophotography and less visual observing. Doublets show a little purple fringing around bright stars during long exposures. I see no fringing during visual usage, just in photos.
  2. SointulArt
    12-18-12
    SointulArt
    This may be helpful: Stacking in PixInsight

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