You can't compare what your eye sees to what a camera sensor sees.
Glass refracts light and the elements in the lens are precisely designed to give the best possible performance. But when you put another piece of glass in front of the lens at an angle that's refracting light it messes everything up.
Even when shooting hockey games, It's impossible for me to get a clear shot through glass if I'm not 100% perpendicular to the glass.
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