The ABC of Photography – Z

The ABC of Photography – Z


Stands for Zeiss Alpha – a range of Sony lenses designed by Carl Zeiss.

Zone system

The Zone system is a systematic technique for calculating the best possible film exposure and development. It was formulated in around 1940 by photographers Ansel Adams (1902-84) and Fred Archer (1889-1963).



A lens with a variable angle of view. On a zoom lens, the focal length can be changed while the focus remains the same.

Zoom ratio

The relationship between the shortest and longest focal length setting of a zoom lens. For example, a 14-42mm lens has a zoom ratio of 3:1, or 3x; a 50– 500mm lens has a zoom ratio of 10:1, or 10x.

Sources:  Pixabay, NASA,Wikipedia, Susan Wingfield Lamar High School