My Oly OM-D with 8mm lens, Nauticam housing with 4.33" dome port, ultralight tray/arms, dual Sea and Sea D1 strobes, and Styx floats.
Weight in air = 10.1 pounds (4.6 Kg).
Weight in fresh water = 0.5 pounds (225 g). Salt water 215 g).
Weight will vary with the lens/lens port, but the above figures will serve as a general guide.
Edited by jlyle, 09 October 2012 - 05:53 PM.