Цитата:от: Павел Ионас
Ответ:
пылезащита : одинаковая.
влагозащита - одинаковая
http://downloads.canon.com/CDLC/EOS50D_5D-MarkII-WP2.pdf
Fortified moisture and dust seals around battery compartment, memory card compartment
and multiple buttons ...
... the weather and dust seals have been improved around the battery
compartments and memory card doors, and increased precision in the alignment of the magnesium alloy external cover seams and in the optimal design of camera parts and structures contribute to the cameras’ dust and water resistance. Internal gaskets and sealing materials are used extensively at the cameras’ buttons, tripod sockets, and surrounding the LCDs. As a result, the EOS 5D Mark II now has dust and water resistance that is almost equal to that of the EOS-1N
кстати, еще начиная с 5дм2, кенон улучшил работу АФ, чтобы он не давал стойкий бекфокус при съёмке под люминесцентными лампами