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Canon EOS (Electro-Optical System) Intro :
As of 2007, Canon has released no fewer than 40 EOS SLR camera models, starting with the introduction of the EOS 650 in 1987. The Canon EOS series helped bring in the digital SLR age with the EOS DCS 3 in 1995, although it was a joint collaborative effort with Kodak. The first digital EOS SLR camera wholly designed and manufactured by Canon is the EOS D30, released in 2000.
Canon has also released two EOS cameras designed to use the APS film format, the EOS IX and the EOS IX Lite.
There is also a manual-focus EOS camera, the EOS EF-M. It comes with all the automatic and manual exposure functions but lacks autofocus. However, it comes equipped with a split-screen/microprism focusing screen for precise manual focusing.
Through the tracking of eyeball movements, EOS cameras equipped with eye-controlled focusing (ECF) are able to choose the appropriate autofocus point based on where the user is looking in the viewfinder frame. ECF comes especially useful in sports photography where the subject may shift its position in the frame rapidly.
ECF is a function that is usually either loved or hated. Some users feel that it is not reliable enough for common use. Others report that they are able to use it reliably. Much of this depends on the user. Eyeglasses can also reduce its accuracy for some.
EOS cameras equipped with ECF are the EOS A2E (U.S. model names are shown; see the table below for equivalents in other countries), EOS Elan IIE, EOS-3, EOS Elan 7E, and EOS Elan 7NE.
EOS flash system
The flash system in the EOS cameras has gone through a number of evolutions since its first implementation. The basic EOS flash system was actually developed not for the first EOS camera, but rather for the last high-end FD-mount manual-focus camera, the T90, launched in 1986. This was the first Canon camera with through-the-lens (TTL) flash metering, although other brands had been metering that way for some time. It also introduced the A-TTL (Advanced TTL) system for better flash exposure in program mode, using infrared preflashes to gauge subject distance.
This system was carried over into the early EOS cameras wholesale. A-TTL largely fell out of favor, and was replaced by E-TTL (Evaluative TTL). This used a pre-flash for advanced metering, and used the autofocus system to judge where the main subject was for more accurate exposure. E-TTL II, which was an enhancement in the camera's firmware only, replaced E-TTL from 2004.
Canon Speedlite-brand flashes have evolved alongside the cameras. They are capable of wired and wireless multi-flash setups, the latter using visible or infrared pulses to synchronise.
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