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What is a lens?

A camera lens is an optical lense or a series of lenses which is used in conjunction with a camera body to focus light on a photographic film.

Lenses

What is Focal Length?

Focal Length is a measure of how strongly the system converges or diverges, focuses and defocuses light.

Long Telephoto

Focal lengths of different lens types.

Medium Telephoto

Short Telephoto

Standard

Wide-Angle

Ultra Wide

300mm

200mm

85mm

45mm

or

50mm

35 - 24mm

35mm

24mm

450mm

300mm

140mm

75mm

45mm

(cc) image by anemoneprojectors on Flickr

35mm

6 x 4.5 cm

(cc) image by anemoneprojectors on Flickr

500mm

350mm

150mm

80mm

50mm

40mm

6 x 6 cm

By Lewis Woods and Rianna Dulake

Wide Angle - Having a short Focal length and hence having a field covering a wide angle.

Telephoto - A lens with a longer focal length than standard, giving a narrow field of view and a magnified image.

What is Angle of View?

In photography, angle of view describes the angular extent of a given scene that is imaged by a camera. It is how much angle is in a frame. For example a 180 degree camera angle will show everything from the sides in front as if it were a straight line it would show everything infront of that line. It will capture the whole image. They sometimes call a wide-angle lens a fisheye lens because it gives the photo a weird perception to the photograph.

Zoom - It consists of two distinct lens systems, the zoom system and the focusing elements. The key element of the zoom system is a concave lens which disperses the light path, and which can be moved relative to a convex lens behind it which gathers it in again.

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