Housing of Underwater Digital Cameras
Underwater digital cameras almost exclusively have housing to keep the technological parts from getting wet and destroyed. These housings can be made of inexpensive plastic to higher priced aluminum casing. Housing offer many options for the user, since they can choose the housing specific for their every day land camera. They can also use any lens in their collection for their photography. Housings will also have watertight ‘o-rings’ at all points where materials meet to keep water out of the housing and the camera. Underwater housings are outfitted with control knobs that access the camera inside and give the photographer the normal camera functions.
Underwater digital cameras give the photographer an added advantage over simple film cameras. Digital allows for many more pictures to be taken in a session. Since there is no film to change (nor could you change film underwater anyway), you can take many more photos with your underwater digital camera than you could with an underwater film camera. Your digital camera can also be outfitted with increased memory cards as high as 8 and 16 gigabytes. Most digital cameras will have options where you can plug more than one memory card into the camera as well.
Since typical flash on a camera will not be strong enough to penetrate the refraction of the water, many housing units will have a separate flash system that is outside of underwater digital cameras. This flash system will be found outside the camera and housing itself and be connected via fiber optic cable. Flash should not be used as the primary source of light. Flash should serve as a supplement. However, there are situations where flash is your only option. With these situations a strobe can be used to serve in a way that you can correct and re-correct your photos as you take them.
Fish Eye Lens
Using most lenses is likely to distort the image you are trying to take photographs with underwater digital cameras. One of the best ways to limit the amount of distortion due to refraction is to use a fish eye lens. In above water photography, a fish eye lens will make a photograph appear as if you are looking at it from the view of a corner mirror in a convenience store. However, when you put this lens into the water, the refraction effect will turn the photo from that of the mirror into a typical photograph.
The problem of refraction is not a problem when using macro lenses. In fact, the increase of refraction actually helps the macro lens pick up more of the image one is trying to take pictures of. This is a benefit to photographers who are trying to take photos of very small subjects. With the macro lens, especially with wide angles, photographers can eliminate the need to have excessive water between the camera and the subject. Macro lens offers close focus which can be very helpful.
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