Originally Posted by irfubar
Originally Posted by 4th_point
Originally Posted by irfubar
Curious how these fairly substantial chunks of glass could crack with no visible external signs of an impact?


I've heard rumors of "cold shock", but primarily related to Kowa fluorite crystal. Never experienced it with any of my optics.


I could buy that, but wouldn't that be covered with a warranty?

Also it hasn't been that cold this winter


People claim hot truck to cold ambient, or maybe versa vice. Seen it mentioned several times, but always seems to be a Kowa.