Lenses

For simplicity, we can refer to lenses with short focal lengths (less than 50mm) as wide-angle lenses.
Lenses with longer focal lengths (more than 50mm) are called telephoto lenses.

Zoom lenses offer a range of focal lengths in a single lens for convenience.

Wide-angle lens Focal length: 28mm		Standard lens Focal length: 50mm		Telephoto lens Focal length: 200mm
Angle of view is wide, the subject appears smaller.		Angle of view is average. A 50mm lens simulates the viewing angle of the human eye.		Angle of view is narrow, the subject fills the frame
Characteristics: Exaggerates perspective. Foreground objects look larger, background objects look smaller. High depth-of-field.		Characteristics: Natural perspective. Medium depth-of-field.		Characteristics: Flattens perspective. Background objects look larger. Low depth-of-field.