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They are generally not important for dive safety, but are required for the video camera to get an acceptable image quality, either for video recording, or for the surface team to monitor the work done by the diver. Modern underwater video lights are now relatively small, have run times of 45–60 minutes and output 600–8000 lumens.
As the HID lights use less than half the power of an equivalent tungsten-halogen light, a significantly smaller and lighter-weight power supply can be used. HID lamps have also become common on many aircraft as replacements for traditional landing and taxi lights. [citation needed] HID lamps are also used in lamps for underwater diving.
Norwegian diving pioneer Odd Henrik Johnsen with underwater camera (1960's) Underwater camera, strobe (flash), video lights and housing - for underwater photography or underwater videography; Diving reel, dive spool or line holder to store and transport a distance line or line for a surface marker buoy.
Baited remote underwater video (BRUV) is a system used in marine biology research. By attracting fish into the field of view of a remotely controlled camera, the technique records fish diversity , abundance and behaviour of species.
Small "action" cameras such as the GoPro style cameras have taken diving by storm and create incredible images for relatively little cost, provided that there is sufficient light. These cameras often record on SDXC/HC or MicroSD cards. These cards should have data record rates of at least 45 MB/s (Ultra) [19] or faster.
A Nikonos V amphibious camera Underwater housing for SLR with dome port, arms and lights. Some cameras are made for use underwater, including modern waterproof digital cameras. The first amphibious camera was the Calypso, reintroduced as the Nikonos in 1963. The Nikonos range was designed specifically for use underwater.
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