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Old 14-01-2021, 09:00 PM
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gaseous (Patrick)
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Join Date: May 2016
Location: Brisbane
Posts: 782
It's funny you ask this question, as I sent an email to Don Pensack this arvo (he runs Eyepieces,Etc in the USA) regarding 100 degree eyepieces. I was asking for his opinion regarding the 21mm Ethos vs 20mm Stellarvue Optimus. He implied that the 21E is a better eyepiece, but couldn't say it was worth the 2x price tag. He also mentioned the 20mm APM XWA, which is apparently very similar internally to the Stellarvue and is also very good and only 1/3 the Ethos price. A few online comparisons suggest the APM is a very good eyepiece for the money. I use an ES 14mm 100 degree in my 20" dob and it's a very nice eyepiece. Thinking about a 20mm eyepiece in the future, maybe the APM.
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