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If it works well, apart from getting dual use out of an expensive eyepiece, there is no other 20mm eyepiece which can equal the 80 degree, sharp to edge field with decent eye relief.
Nagler 22mm doesn't have the edge performance, Nagler 20mm and Ethos 21mm don't have the eye relief.
Edit: thanks John, saw your post after I hit the submit button. Good to hear it works well. It'll be used in my 6" f/5 achro with and without the barlow and in the C11.
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