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  1. Mark9473

    Nikon Monarch 5 - spots on lenses

    I've used pure alcohol (ethanol) on my ED telescope. Works very well. You can get some at the pharmacy. I've also used Baader lens cleaning liquid on a variety of optics, I believe that's based on isopropanol, a different alcohol. By the way, ED is not a coating on the eyepieces, it's a glass...
  2. Mark9473

    Nikon Monarch 5 - spots on lenses

    To me it looks like you're just being a bit too gentle at cleaning them
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