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Very good point, Colin. When I designed my 17.5"er, I aimed for a 22mm fully illuminated field. Just the ticket for this EP to be given its full potential.
This does make the RKE a special beasty. In my 17.5" f/4.5 dob, my 28mm RKE is remarkable, and easy to use. Of course, not as wide FOV as a Paragon (68*), but just a bright. In my 8" f/4 scope, coupled with the 28mm, this union outperforms my 10" f/5 dob, and a 13.1" f/4.5 from my home in Sydney. A really unique combination for a light polluted enviroment.
Another unique feature of the 28mm RKE is its extraordinary long eye relief, nearly a full inch. A little tricky to use at first as you just cannot bring your eye in closer or you just cannot see. Makes that you need to be able to hold your eye steady, floating above the EP, and not resting on a rubber eyecup. I like it, some other fellows just can't get used to it.
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