While perhaps not a stupid question, it's one that can't be answered.
Back when I published my first hunting optics book in 1999, the publisher insisted I use some information from DEVA, the quasi-governmental German organization that tests a lot of hunting (and other) equipment. Among the supposedly scientific DEVA tests (which included measuring light transmission) was one involving a rubber hammer. After sighting-in a rifle, they'd whack the scope a few times in"strategic" places, to see if it changed zero--but they whack American scopes more, because (they noted) they were more likely to lose zero.
