Originally posted by Marc Sabatella If the focus screen is crooked, then the lnes etched into the viewfinder will be crooked, and this may cause you to mistakenly tilt the camera in an effort to make your horizontals and verticals line up with those crooked etched lines.
Riiiiight, right, right, rightrightright... that makes plenty of sense .
My screen's don't have lines, but... I can see how this could happen with those that did.
PS. I purchased a pack of hotshoe bubbles a few years back, it's funny how we take things for granted sometimes. I guess I use it quite bit when I'm doing landscape etc.