Marmot Posted May 14, 2021 Share Posted May 14, 2021 Hi Another question from a relative newcomer. I have come across various references to ED glass being used in Refractors and I am just trying to work out exactly what the advantages are. The obvious one, that comes up time and time again, is that it reduces CA. But are there other advantages? If the ED glass is better optically then will it provide clearer crisper views? The other question that springs to mind is as follows: If ED glass is that much better than your standard refractor, then will it be capable of taking a higher magnification when compared to the same size standard achro? In case it makes any difference to the answers, my interests at this time are purely observing and not AP. thanks in advance. Quote Link to comment Share on other sites More sharing options...
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