Photo- and video-lead - what they are and which ones fit your housing.
ewa-marine has developed special photo-, BF1 and video-, BV2, lead weights to be used in conjunction with our housings. These weights can be used to trim the housing to be neutral at a depth predetermined by the diver.
Both weights are covered in a special latex to ensure that the can not leave any marks on or scratch your camera.
Please note, that the flexible housing behaves just like the organs of a diver with regards to water pressure. As stated by the law of physics of Boyle-Mariotte (pressure x volume = constant) the volume of air in the housing (just as that in the lungs, diving jacket and the air inclusions in the diving suit) decreases as it descends. In other words, a housing that is positively buoyant on the surface will be neutral at a certain depth and thereafter even show a tendency to sink. This point can be "adjusted" by adding weights to the housing, the amount of air included in the housing and some practice...
please also read: "how much air should there be in the closed housing"
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