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I know you mentioned 40mm +, but I have a couple of recommendations under this focal length for a number of reasons.
The Pentax 30mm XW and the TeleVue 24mm are great wide EP's from my experience (F5 scope). Do you want 60, 68, 70 or 80 degrees AFOV?, this will usually decide how much you need to spend.
From an exit pupil perspective, 40mm EP focal length will be the max limit for an F6 scope. A young adults eye usually only dialates to 7mm, and less the older you get, a 40mm EP in an F6 scope will give you 6.67mm which is still under but the conditions must be dark and perfect for the iris to dialate to this.
I would recommend the above mentioned or the Burgess/TMB 40mm Paragon (field curvature ?????) but much better than GS, or if you want to spend more money, the TV 35mm Panoptic or 31mm Nagler $$$$$$, the OZ dollar at the moment does not help.
GS eps are cheap but just useable I guess for a while, but like everything, you get what you pay for. The more you pay, the better corrected the EP will be for a semi fast scope. FC is a prob with cheap EP's, don't expect the best with the cheapies.
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