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2. Underwater videography - Wikipedia

   en.wikipedia.org/wiki/Underwater_videography

   The primary difficulty in underwater camera usage is sealing the camera from water at high pressure, while maintaining the ability to operate it. [14] The diving mask also inhibits the ability to view the camera image and to see the monitoring screen clearly through the camera housing.

3. Full-face diving mask - Wikipedia

   en.wikipedia.org/wiki/Full-face_diving_mask

   A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]

4. Diving mask - Wikipedia

   en.wikipedia.org/wiki/Diving_mask

   A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including scuba divers, free-divers, and snorkelers, to see clearly underwater. [ 1 ] [ 2 ] Surface supplied divers usually use a full face mask or diving helmet , but in some systems the half mask may be used. [ 2 ]

5. Diving helmet - Wikipedia

   en.wikipedia.org/wiki/Diving_helmet

   These may be worn with a full-face mask or half mask to provide impact protection when diving under an overhead, and may also be used to mount lights and video cameras. [3] [4] An alternative to the diving helmet that allows communication with the surface is the full-face diving mask. These cover most of the diver's face, specifically including ...

6. Snorkel (swimming) - Wikipedia

   en.wikipedia.org/wiki/Snorkel_(swimming)

   Ocean Reef snorkel mask Snorkelling equipment: FFSM, fins and underwater camera. Full-face snorkel masks (FFSMs) allow users to breathe nasally or orally and can avoid gag reflex in response to standard snorkel mouthpieces. The breathing air path through a full-face snorkel mask can vary depending on basic layout and internal details.

7. Underwater vision - Wikipedia

   en.wikipedia.org/wiki/Underwater_vision

   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 ...