Thanks for the thread i was wondering about the difference i these two eyepieces myself. The 21mm is just far too expensive. I do prefer my naglers and looking forward to clear skies so i can try the 20mm nagler type 5 i grabbed not long ago. I do have an ethos 13mm and had the 17mm burr sold it as i found kk was not using it like i did the naglers. Just smaller and lighter. The ethos 3.7 110 degree eyepiece has limited use as well and requires really steady viewing conditions.
Thanks again. This thread helped answer a few questions i had about the two eps.
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