Sigma 12-24 lens, the focal length of a lens, together with the size of the image sensor in the camera (or size of the 35 mm film), determines the angle of view. A lens is considered to be a “normal lens”, in terms of its angle of view on a camera, when its focal length is approximately equal to the diagonal dimension of the film format or image sensor format.
source: wikipedia
Photography
Photography is the art, science & practice of creating durable images by recording light.Apr4 08
Share it
