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Hi All,
Just been reading all the posted comments on Canon Lenses for Astrophotography use, wonder if I missed something, are these "ED" Glass ones that you are talking about, I know Canon made some "Fluroite Glass" ones (very expensive) but as this glass is very brittle they have gone to ED Glass so ive read, looking around NIKON ED lenses seem much cheaper and with an adaptor should work on the Canon (not auto though) comments please.

cheers....Jim