I live in Thailand throughout the year, every day I take my xt1 with varying lenses walk to work outside on sites and inside in Aircon I use 10-24, 35f2, 27, 60 never had problems even shot longexposure with 10-24 other night in medium rainy conditions water on the lens and camera didn't faulter ...... Maybe if the rain was monsoon and the water in the lens mount but I wouldn't shoot out in those conditions anyway , im grabbing the 23 f1.4 for $550 so can't complain at that price