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Actually I think we are at cross purposes here somewhat (Also you have the terms wrong way around there, that is the TFOV formula not AFOV)
what I am is if you have the same mag (EP FL) and equivalent field stops, do different AFOV designs produce a difference in apparent contrast/sky darkness.
Looking a little deeper I think some marketing approximations might be leading to my question anyway. Compare a Nagler 31 and a 30mm ES 82 degree EP. Both supposed to be 82 degree apparent fields. Generally it is accepted that higher mag will result in smaller TFOV.
The ES 30mm has a larger field stop than the Nagler 31mm and thus both greater mag and greater TFOV in the same scope. I reckon either the Televue has a slightly smaller AFOV than stated or the ES has slightly larger.
I think my question has probably grown out of comparing things which don't really compare.
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