Aside from a manufacturing defect, how would prisms crack and the exterior of the bino show no sign of damage?
There is a lot of stuff that can be dropped and broken without signs of damage--I have a Makita hammer drill that did just that.
These are supposedly the very best binos, designed for serious hunting and outdoor use,
For the price charged they should be able to stand carried any fits bed in the field and extremes of temperature. If they can’t handle some time in the field and done cold or hot weather, then regardless of optical quality they are unfit for use as a hunting optic.
If lens or prisms, or a myriad of other parts are already damaged--like a windshield--cracks can and most likely will propagate. That's simple common sense and experience.
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