Common Features
Other features found on many SLR cameras include through-the-lens (TTL) metering and sophisticated flash control referred to as 'dedicated electronic flash'. In a dedicated system, once the dedicated electronic flash is inserted into the camera's hot shoe and turned on, there is then communication between camera and flash. The camera's synchronization speed is set, along with the aperture. Many camera models measure the light that reflects off of the film plane, which controls the flash duration of the electronic flash. This is denoted TTL flash metering.
Some electronic flash units can send out several short bursts of light to aid the autofocus system or for wireless communication with off-camera flash units. A pre-flash is often used to determine the amount of light that is reflected from the subject, which sets the duration of the main flash at time of exposure. Some cameras also employ automatic fill-flash, where the flash light and the available light are balanced. While these capabilities are not unique to the SLR, manufacturers included them early on in the top models, whereas the best rangefinder cameras adopted such features later.
-
Cut-away of a Minolta XE film-based SLR
Read more about this topic: Single-lens Reflex Camera
Famous quotes containing the words common and/or features:
“Nothing shall warp me from the belief that every man is a lover of truth. There is no pure lie, no pure malignity in nature. The entertainment of the proposition of depravity is the last profligacy and profanation. There is no scepticism, no atheism but that. Could it be received into common belief, suicide would unpeople the planet.”
—Ralph Waldo Emerson (1803–1882)
“However much we may differ in the choice of the measures which should guide the administration of the government, there can be but little doubt in the minds of those who are really friendly to the republican features of our system that one of its most important securities consists in the separation of the legislative and executive powers at the same time that each is acknowledged to be supreme, in the will of the people constitutionally expressed.”
—Andrew Jackson (1767–1845)