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Allan
I used a 21mm Ethos on my 12" f5 for a short while and found it very pleasant and easy to use. Just be aware it is a heavy beast, I had to adjust my balancing weight even when switching from the 17mm Ethos.
Marks point about exit pupils is correct, and also his comment about the 22mm Nag is certainly valid, unfortunately I haven't used the 22 in my 12" so cannot give a practical view.
Having said that I have done a direct comparison between the 13mm T6 Nag and the 13mm Ethos and the Ethos won easily. The larger field was complemented by much sharper definition and better contrast.
Please note I am in no way an expert on optics, I only try stuff out and see if they appear better to me!
Malcolm
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