Prime Lenses and Zooms

According to About.com Photographic lenses come in two main types: fixed focal length (prime lenses) and zooms. Zoom lenses let you alter the focal length - and thus the angle of view that the picture takes in - while remaining focussed at the same distance.

So - Zoom or Prime Lens?
Generally affordable zoom lenses have smaller maximum apertures than most fixed focal length lenses.
Prime lenses are generally lighter than zoom lenses, but a zoom lens will possibly replace two or three prime lenses, and be lighter, cheaper and less bulky than three lenses.

Prime lenses usually have less distortion than zoom lenses.

When photographing a rectangular subject, the image almost always will either bulge slightly out in the middle giving a barrel effect, or slightly in, resembling a pincushion. Lenses with 'good drawing' are those that have low distortion. The effects of distortion are usually only noticeable with subjects with straight lines - such as most buildings, seldom with portraits etc.

More details on Lenses tomorrow.

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