Lens and Focal Lengths
The focal length is indicative of the optical length of a lens. It is measured in millimetres (mm). Basically there are 3 main types of lens that are classified according to their focal lengths:
1. Normal lens- this range from 35mm to 85mm. It is close to how the human eye perceive things.
2. Wide-angle lens - basically any lens below 35mm is considered as wide-angled. This ranges from 14mm - 18mm (super wide angle) to 28mm-35mm (wide angle). Wide angle lens give greater field of vision than normal lens.
3. Telephoto lens -basically any lense above 85mm is consider as telephoto. These lens allows one to capture scenes that are normally too far away.
All the different classes of lens exhibit very different characteristics.
More indepth details on the specific applications of the various lens will be covered as separate posts.
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