I had a perfectly good Denkmeier 21mm EP that gave similar TFOV as my 13mm Ethos but at a somewhat lower mag. It just didnt get used and I sold it. Being able to see relatively extended objects at a higher mag with a darker background makes the wider FOV worth it to me.
I bought an 8mm and am still tossing up whether to get a 21 or 20mm 100* EP
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