Once upon a time I was a photographer in the RAAF. One day I was photographing the interior of a new building. I attached my trusty Hasselblad to the tripod and proceeded to measure the colour temprature of the ambient light then suddenly , heard a crash. The 'blad had fallen off the tripod onto the as yet un-carpeted concrete floor. After my initial heart attack I checked the camera and it seemed to work fine, after processing the pic's it seemed the camera, it's lens (and me) were fine