Fast Newt's, binos and fast refractors are all very different optical beasts. They all present very different focal plane shape and other challenges for an eyepiece to deal with. And for an eyepiece to deal well with each scope design, it is staggering. The price tag is not a surprise, nor is it that this eyepiece comes in just one single focal length - to create a line of focal lengths that perform the same like this piece in so many different scope designs is close to impossible. We see this performance variation in all brands and models. BUT, we do see that there are some single focal length pieces that do perform exceptionally well in different scope designs, like this Docter. None of these eyepieces cost chicken feed either!
If someone does manage to get their hands on one of these Docter pieces, I hope they will be able to give a review using the eyepiece in different scope designs, Newt, SCT, refractor, etc, not just the one. Neat too, not just with a coma corrector or other devise. With so many combinations of scope and eyepiece, it will take some time to complete! Oh what a dreadful, loathsome task...
