digital cameras zoom

Digital Camera Zoom

Understanding Digital Camera Zoom Lenses

By Michael Huddleston

There are two types of zooms used with digital cameras: optical and digital.

Optical Zoom: An optical zoom changes magnification by moving glass in the lens, changing the image falling on the sensor. Using an optical zoom maintains picture

quality.

Zoom Ranges and 35mm Equivalents: Optical zoom lenses usually have a specification called “equivalent in 35mm.” This tells you the zoom range of the digital camera compared to a 35mm film camera. Typical 35mm equivalent zoom ranges you will see listed are 35mm-70mm or 35mm-105mm.

For example: Wide-angle means a lens takes in more than normal viewing perspective. Telephoto lenses magnify the subject, bring it closer. Using these numbers as a guide, you can get an idea of the range of zoom lenses and what they will do for you.

28mm…..wide angle

35mm……slight wide angle

50mm…..normal perspective

70mm…..slight telephoto

105mm…..moderate telephoto

135mm…..strong telephoto Continue reading →

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