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Interesting thoughts, and one which ring home with me, "You get what you pay for" same old theory with optics I am afraid.
One that does swim against the current though, is an older Celestron 20mm Erfle. I have had one for ages, and it is pretty beat up. I bought another recently, and they are the two I use in my Denkmeir bin viewer, almost exclusively. With about 60 - 65 degree fields they are just right.
Does it compare to the 22mm Nagler type 4?? No way, but at a fraction of the cost I don't expect it to.
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