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Forum: Pentax K-3 & K-3 II
01-07-2016, 10:08 PM
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Hi
I should point out that the pump action of short to long zooms resulting from long extending tubes is indeed extremely strong. If you zoom in and out quickly, as you would do when shooting football where players are far and near a lot, the resulting pumping strength could be nearly as strong as that of a bicycle pump. (Maybe not quite, but you can see what I mean). In a none sealed lens the pumping strength is somewhat mitigated because there are no seals to offer extra resistance.
When you zoom in very fast you create a partial vacuum inside the camera body and when air rushes back into the body through less than fully sealed spaces it takes water with it that was hanging around there . Once the water is distributed deep inside the body it simply cannot be expelled by any reverse pumping action. Consequently it will be accumulating. The body can't be totally sealed otherwise you would not be able to zoom in and out very well.
I bet you constantly sucked in water into the body by your fast zooming action. The best way to avoid this from happening, at least partially, is to zoom in and out as slowly as you can.
All demonstrations I have seen to demonstrate Pentax's water sealing by pouring water over the camera (and I have poured water over my own camera to wash off salt which accumulated during ocean sailing) is fine as long as the lens is not zoomed or any other part of the camera is being operated during the process and water is being toweled off before usage continues.
Cheers.
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