I don't have a mirrorless camera yet (using interch. lenses) but have been reading about their similarity in some ways to the 35mm rangefinder cameras. So, it cropped up in my thoughts how, in the old days, the photo magazines used to say rangefinder camera lenses that had been left focused at infinity would burn a hole in the focal plane shutter if, let's say, theoretically the camera was left on a table pointing at a window and the sun passed by during the day. I still haven't read up enough on mirrorless cameras to know if they have focal plane shutters or just "blink" their sensor on/off for an exposure or whatever but was wondering if this "sun burning a hole" situation has resurrected itself to be of relevance in the digital world and a potential danger to sensors or FP shutters again? Or, hasn't anyone thought of this yet?