There are local people like Roger Davis at Bintel's Melbourne store (and no doubt others, I name the one I know of who does this commercially) who can do quality optical repairs and restoration work. Unfortunately, I doubt Roger has a spare field lens for a 13mm Ethos eyepiece laying around. I don't believe that Tele Vue sell parts like lenses (I'd love to be corrected if I am wrong) but they will service their eyepieces and scopes.
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