Answering your question about viewing through the Ethos eye pieces , I find them extremely comfortable with 15mm of eye relief and a huge 100 degree AFOV
I use an adjustable bar stool which has a foot rest ring you use to raise or lower the seat height ( bought it from office works for $50 )
My head usually remains steady and just use my eye ball to observe the whole FOV to edge of field
I wear glasses and can choose to view with or without glasses. However my left eye does not have astigmatism like the right eye ( only myopia ) so I choose to view without glasses with my left eye and bring the object into focus
I do use a Televue Paracorr type 2 coma corrector which provide tack sharp stars to edge of field , another superb Televue accessory
Cheers
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