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Remote controls
Wired remote
Wired remotes have been available for single lens reflex cameras for a long time. Almost all digital single lens reflex cameras have a socket to accept a wired remote.
The purpose of a remote is to trigger the shutter while limiting vibrations, which can be useful for long exposures.
Remotes also allow the shutter to remain open on Bulb mode without holding the shutter button depressed. In Bulb mode you can keep the shutter open as long as desired so you are in complete control of the exposure time.
Wireless remote
Wireless remotes are newer and allow the shutter to be activated from a distance. This can again be useful to reduce vibrations or for self-portraits.
Many DSLRs have an infrared port in front and at the back of the camera to allow remote operations from almost every angle.
Controlling a DSLR through a PC:
Some cameras, such as the Canon XSi, let you have full control of the camera through a PC. The camera is connected to the camera with a cable. All settings are controlled from the computer using the provided software. The image and all settings are displayed on the computer screen.
