the underwater photographer often needs to raise the sensitivity and use a relatively large aperture in order to keep the shutter ' s optical ISO speed within a reasonable level that allows photographing moving marine creatures . It is also necessary to understand the phenomenon of light refraction in water , as objects partially submerged in water appear at a different angle from reality , and most importantly , the human eye under water sees things closer than they really are , and this must be realized when estimating distances such as the distance of a camera from The subject or setting the appropriate distance to place the flash lights , or even the photographer ' s distance from the surrounding environment elements such as coral or rocks .
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11th ISSUE DIVENTURES MAGAZINE