camera is a camera that takes video or still
photographs, or both, digitally by recording images on
a light-sensitive sensor. Many compact digital still cameras can record
sound and moving video as well as still photographs.
In the Western market, digital cameras outsell their 35 mm film
Digital cameras can include features that are not found in film cameras, such as displaying an image on the camera's screen immediately after it is recorded, the capacity to take thousands of images on a single small memory device, the ability to record video with sound, the ability to edit images, and deletion of images allowing re-use of the storage they occupied.
Digital cameras are incorporated into many devices ranging from PDAs and mobile phones (called camera phones) to vehicles. The Hubble Space Telescope and other astronomical devices are essentially specialised digital cameras.
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While some of the least expensive digital cameras have only automatic focus, meaning the camera does all the work on bringing your subject into the best possible focus, most SLR digitals offer three different focus modes: manual, single auto focus and continuous auto focus.
All three of these will be addressed here. With manual focus, the camera stays out of the focus equation and you, the photographer, make all the decisions regarding this. This is done by setting different buttons or actually using an attached focusing ring that rotates on the camera lens.
For those who like to have complete creative control of the finished product, this is the best focus mode. In single auto focus mode, the camera automatically focuses when you press the shutter button either all the way down to shoot a photo or half way down to lock the focus. This mode is useful when shooting static objects. In continuous auto focus the camera continuously focuses on the objects in the photo.
In this mode the camera continuously corrects the focus as the objects distance from the camera changes. This mode is useful when you shoot photos of moving objects such as a race car during a race or airplanes during an air show. You can hold the shutter button half way down and continuously move the camera to follow the object.
The camera will continuously keep the object in focus. Like any other feature automatic and manual focus modes have their pros and cons. The first step to using them to your advantage is to understand how they work and what they were designed for.
The next step is to experiment shoot photos using different focus modes and different types of objects and see how the camera behaves. Once you have done that you will be ready to instinctively use the best focus mode for each photo situation.
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