Prime Lens (FFL)- lens is one that has just one focal length only (in contrast to a zoom lens that covers a wider range of lengths). Prime lenses come in a wide range of focal lengths from wide angles through to the very longest of tele-photo lenses used by many sports photographers and paparazzi.
Wide- Angle Lens- can be a powerful tool for exaggerating depth and relative size in a photo.
Calypso underwater camera- is a high-performance underwater camera suited for various underwater applications up to 90m deep.
Through-the-lens (TTL) metering is a photographic term describing a feature of cameras capable of measuring light levels in a scene through their taking lenses, as opposed to a separate metering window.
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