I have a Crown Graphic Special and the stock 135mm f4.7 Schneider Xenar lens that I've been using and just recently used in sub zero climate. I quickly discovered the shutter having difficulty cocking ie it would move and not lock into place until after a couple tries and all shutter speeds were markedly slower. The one second exposure in particular would last for a good 3 seconds. I've sparsely come across the subject of "winterizing" and wonder what other people's experience are on the matter.