Originally posted by Not a Number I don't think the WR DSLRs, lenses and flashes are intended to be immersed in water. Maybe at most dropped or set down in a puddle of water. Does the "W" stand for water or weather? If they wear meant to be immersed they would probably have some water resistance rating on them - in meters, bars or atmospheres..
The "W" stands for Weather Resistant, and sometimes they advertise that as drip proof. I think you are spot on about a rating if immersion was intended. It's not meant to be immersion resistant. I have used my K-30, K-50, DA18-135WR, and DA* 300 in all kind of rain and stow. Even in a hard rain there's really little pressure on the seals. I would think the water would have to "pool" on a seal to create pressure to break it, maybe holding a zoom front element up or something like that. I would guess most failures are from a seal being seated improperly in the manufacture, defective in its own manufacture, or somehow deteriorating from a chemical or age. These are only my theories, I have no way to prove or disprove them.
---------- Post added 08-26-15 at 09:55 PM ----------
Originally posted by Not a Number We could always put the DigitalRev guys up to some water immersion tests. They did freeze a Canon into a block of ice one time.
Kind of like this: