My UO 7mm ortho gets a lot of use in both the 10" f/4.5 and the 6" f/8, and the eye relief is useable - just!. I also have a 5mm and find it is generally too much mag and too little eye relief. BTW also have the UO 9mm ortho and it beats my 9mm T6 Nagler for on-axis brightness and resolution, but of course the Nagler has a much bigger fov and is more comfortable to use.
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