Bill very few plossl's left in existence, just all ep's labelled as plossl are in fact symmetrical..i have a couple of the vite eyepieces, cheap on ebay, low lens count, also have plastic lenses; not a problem if they are figured well, plastic can be just about as good as glass
there are still some clave plossl at Melb Obs in botanic gardens, true French plossl from yesteryear..they are good eyepices but nothing spectacular
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