Mixed Gas Training

Mixed gas training can be broken down into several different classifications. There is no class or certification called “mixed gas.” Mixed gas is typically classified as the combination of helium, nitrogen, and oxygen, which is called trimix or just helium and oxygen, which is called heliox. Trimix is quickly becoming the more popular mix for technical divers today.
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Underwater Video Camera Housings

An underwater housing is what keeps your camera dry at depth. This is a critical job, since one drop of saltwater hitting the camera in the wrong place can destroy it. The prominent companies making housings generally have this problem well solved by design, else they wouldn’t be in business very long. However, being a dependable moisture barrier is not the only important quality to look for in housings. There are other key features and characteristics that, if absent, can really limit the capabilities and enjoyment of your underwater video system. We’ll look at all these areas to help you make a choice that’s right for you.

Optics

Water removes warm colors from sunlight with depth. It also magnifies subjects by about 33 percent. To compensate for these two effects of water on underwater video, it’s extremely important that the housing support the proper lens optics underwater. There are two fundamental requirements.


The housing should support a color-correcting filter that can optionally be selected underwater. This can mean one that is inside the housing and flips in front of or away from the lens using a mechanical control, or it can mean an external ‘wet’ filter that can be pushed on or pulled off the housing’s lens port. Most housing manufacturers incorporate the optional use of a color-correcting filter underwater. Optional is the key, because you only want to use the filter when your primary source of light is the sun. If you start out a dive in open sunlit water, but then penetrate a wreck or enter a swim-through where it becomes dark and you switch to artificial lights, you’ll need to remove the filter.
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Deep Diving Training Frequently Asked Questions

Where can you get deep diving training?

A number of training organizations offer different types and levels of deep diving training. Training organizations such as, IANTD, GUE, NAUI, PADI, and TDI all offer deep diving training. If you are looking for technical deep diving training, finding a dive shop in your area with technical instructors may be difficult. Typically, only dive shops that categorize themselves as “technical” shops offer this type of training. You may have to travel out of your area to find a dive shop or instructor.

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