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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.
A few underwater lights have a focusing facility by which the beam angle can be adjusted. There are two ways this can be done, depending on the basic emission pattern of the light source. HID lights, which generally produce non-directional light, are usually focused by a reflector, which can be slid longitudinally over the light.
A video light is a powerful light source used primarily for shooting video in environments with insufficient natural light, but can also be used as the primary light source for still photography. Placement of the video light follows the same recommendations as for flash photography, with the advantage that the illumination can be clearly seen ...
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.
The first GoPro Hero, a film camera encased in a waterproof shell. The company was founded by Nick Woodman in 2002. [10] He was motivated by a 2002 surfing trip to Australia, in which he was hoping to capture high-quality action photos but could not because amateur photographers could not get close enough or buy appropriate quality equipment at reasonable prices. [11]
Compass navigation is a matter of training, practice and familiarity with the use of underwater compasses, combined with various techniques for reckoning distance underwater, including kick cycles (one complete upward and downward sweep of a kick), time, and occasionally by actual measurement, which may involve the length of umbilical deployed ...
In this video, dozens of 15-18 inch speckled trout are attracted to a 1000 W green light mounted on a pier. A fishing light attractor is a fishing aid that uses lights attached to a structure above water or suspended underwater to attract fish and members of their food chain.
Linear polarizing filters decrease visibility underwater by limiting ambient light and dimming artificial light sources. [1] While wearing a flat scuba mask or goggles, objects underwater will appear 33% bigger (34% bigger in salt water) or 25% closer than they actually are. [2] Also pincushion distortion and lateral chromatic aberration are ...