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I have the Ethos 21mm and 13mm. In the 16” SDM THE 13mm was my go-to EP for nebulae and I suspect in the 28” (TechnoFusion mirror from Normand Fullum & 1/30 lambda secondary), it may be the 21mm but as I have so far only had one hour or so at the eyepiece I don’t know yet.
I did briefly use my Nikon 17mm Nav HW 102 degree EP and thought it slightly sharper and more contrasty than the Ethos.
I need to consider my higher power tools for planetary and lunar. I do have a Vixen LVW 8mm and I do have the 2x powermate.
So here’s a question I’ve been wondering about for higher powers to view small objects like planets do you really need 100 degree views? Wouldn’t the Delos prove better?
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