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Thanks guys for input, always great to hear from those that have tried different options. Agree the 17mm range is definitely better suited based on focal length of 9.25. Guess my thinking was that with x.66 reduce in place with a ethos 13mm or es14mm would give about same TFOV / mag and exit pupil as a 20mm would. Also with the powerswitch diagonal and factoring in 46mm baffle of 9.25, something in 13mm / 14mm range can allow for reduce without vignette, whereas a 20mm or 21mm would definitely vignette if x.66 reducer used so would be a barlow / normal only with that option. Guess without extension tube and at x.83 reduce, 20 or 21 would be fine though.
As for ES vs Ethos, you know what its like trawling through forums and you read one stating that edge correction better with ethos and it sticks in your head.. Love the ES 82's I have though. ES 30mm gives 1.05 deg and reading Uncle Rod's blog and his success with 13mm ethos and reducer was what was kinda leading me down this path of a lower mm option to compliment.
Tough choices, if anyone has tried an ethos 17mm in a c9.25, love to hear if edges held up as well as a 13mm would?!
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