Lenses are measured in millimetres and this is known as the focal length of the lens. The standard lens for a 35mm camera is a 50mm lens. If a lens has a shorter focal length than 50mm it is considered to be a wide angle lens and with a longer focal length than 50mm is considered to be a telephoto lens.
Wide Angle Lens
Wide angel lenses are good to use on landscapes allowing you to get more of the image within the frame of the picture. They are also good for focus on objects in the foreground and fading out the distance beyond. The most popular wide angle lens are 24mm and 28mm.
Telephoto Lens
A telephoto lens is really good for sporting events or wildlife allowing you to zoom in on the image from a distance. At a distance the telephoto lens allows you to focus on a subject and shoot that subject in sharp focus whilst the surrounding area of the image is out of focus.
Macro Lens
A Macro lens is used for close up photography and allows you to focus a lot closer to the subject. The quality is very high with a macro lens allowing you great sharpness within the image.
Fisheye Lens
The fisheye lens look like a fisheye and distorts the image so that the outer edge of the image appears to be further away whilst the centre of the image almost comes out to meet you.
Shift/Perspective Contol Lens
This lens is an expensive lens which will move the perspective of a building without having to tilt the camera backwards. This type of lens is good for shooting tall buildings.
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