Don't get sucker in by the bigger objective lens gives bigger FOV. It has other functions eg light gathering and maybe clarity of image, depending upon quality.
Size of the objective lens does not determine FOV.
FOV is all done in the eyepiece lens and the scope internals.
A good example is my old Leupold 3x. It has a huge FOV but the objective lens is the same diameter as the tube itself.
Take a look at what the likes of Swarovski achieve without bulbous front ends.
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