Seires of cameras on a desk
Photography is the art and practice of using light to produce images and record them onto certain sensitized surfaces, usually chemically coated plastic film or a memory card. These materials are embedded inside cameras, devices that take photographs. There is no limit to the subjects a person may photograph. Common subjects include landscapes, people, commercial products, food and buildings, among others. Modern photographers use both analog and digital cameras.
Analog cameras contain a curved glass lens, a shutter and film. As light rays naturally reflect off the photo's subject and hit the lens at different angles, the lens redirects them to a point behind the camera's aperture to form a real image. When taking a photo, the camera's shutter opens as the film inside is placed to where this real image is. Light then hits the film, initiating various chemical reactions that expose the film. The shutter then closes and fresh film is moved behind the shutter for the next picture. These cameras yield better image quality and do not require electricity.
In digital cameras, the redirected light rays hit a semiconductor sensor that converts the light into electrical energy. A firmware drive interprets the electrical energy into binary code that represents every pixel of an image. This information is then recorded onto an internal memory storage unit. Digital cameras provide better convenience, portability, storage and ease of development. (Photo: Wikimedia Commons)

New Yorkers line up for 'Manhattanhenge'

This man's love affair with icebergs will warm you on the inside

Photos capture diversity of life on Earth while inspiring conservation

The story behind kudzu, the vine that's still eating the South

What is crown shyness?

Why the giant heads of 43 presidents are sitting in a field in Virginia

Synchronized fireflies gather for a 'rave' in the Great Smoky Mountains

The bittersweet beauty of Greenland's melting glaciers

8 new UNESCO geoparks that will take your breath away

The colorful, fantastical world of Dale Chihuly

Image Awards celebrate the beauty of invisible biological worlds

Icelandic ice cave looks like glowing amber thanks to setting sun