Originally Posted by Santtu Määttänen
but they ain't durable enough at all times. My 50mm f1.2 ai-s dropped from one meter height to soft carpet and broke the back element as well as made it impossible to focus (knocked it out of threads)
Many years ago, I remember reading that the Nikkor 50 1.2 was rather delicate (had some thin glass bits as I recall) and that a bump to the side of the lens barrel could either break an element or knock it out of alignment, so this is not surprising.
On the other hand, my 300 2.8 AIS while mounted on my motorized F2AS fell off the hood of my car and none of the gear sustained any damage.