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CANON EOS-650
The EOS 650 is totally unlike any other autofocus 35mm SLR on the
market when it made its debut at the 1987 PMA Show. The camera
marked the beginning of a new era for Canon. It was the first of a
whole new series of AF 35mm SLR cameras designed from the ground up
from an entirely new concept as conceived by Canon, where the
camera, lenses and system accessories are fully integrated with one
another through a new, fully electronic lens mount interchange for
the first time. The EOS (Electro-Optical System) concept is a very
thoughtful, two-tiered approach to camera development. It involves
finding the best way to integrate creative power into the camera,
making it easier for the user to put that power to work. So, like
its namesake, the Greek Goddess of Dawn, the EOS concept marked a
new beginning, in this case the making of new technological advances
and creative power to be easily accessible for beginners, amateurs,
advanced amateurs and professionals alike.
The design of the EOS 650 clearly reflected this concept as
pioneered by Canon (the EOS 650 clearly inherited a design similar
to the trend setting Canon T90 of 1986, a short-lived but very
influential non-AF Canon 35mm SLR camera that was launched in 1986).
For example, the operating buttons have been kept to a minimum and
the camera body is incredibly comfortable in the hand. There is
nothing to frighten away the inexperienced photo enthusiast or
divert the user's attention during operation. While most of the
autofocus SLRs at that time were models featuring conventional
designs and technology, the EOS 650 represented a revolutionary
approach to camera development especially in the area of autofocus
operations and ease-of-use to anyone picking up an AF 35mm SLR for
the first time. Its autofocus system is an integral part of the
total design concept Canon had envisioned for the EOS System.
Primarily aimed at first time SLR camera buyers and the average
amateurs, the EOS cameras are not compatible with Canon's older,
manual focus FD-mount system of lenses. The innovative electronic
input dial was the singularly most important operative sequence of
modern camera design. First used on the Canon T90, it proved to be a
hit among owners of this remarkable camera so it was appropraite for
Canon to include this breakthrough design not only on the EOS 650
but on every EOS model that comes along including those designed for
the APS and the digital series. It is a very successful concept as
the main dial design is also much copied by the competitions with
some having evolved into other variations too (left/right rotation
as opposed to Canon's up/down rotation design) but the concept is
the same.
As one already knows, photo consumers are generally intrigued by the
prospects of entering into the domain of SLR photography but they
are also a little wary of the variables-focus, exposure and other
aspects associated with using conventional SLR cameras. The EOS
cameras are designed for ease-of-operative and can even be handled
as Canon's own Prima (Sure Shot series in North America) range of
P&S compact 35mm cameras. They will take care of everything, from
focusing, exposure, film transportation and even an automatic
Depth-of-Field mode, allowing the users to concentrate fully on what
they wanted to achieve.
CANON'S UNIQUE LENS-INTEGRAL DESIGN The biggest difference of the
EOS system as compared with other body integrated AF system
available during that time was the way how the autofocus mechanism
devised by Canon works. As for the camera, the most striking visual
difference between the EOS cameras and the older manual focus Canon
bodies is the oversized, new three-lug bayonet mount. This new lens
mount has a very large diameter and permits the design of very fast
lenses with large rear elements. Gone are the mechanical lugs and
pins for mechanical linkage between camera and lenses for exposure
control and information transfers between camera bodies and lenses.
Virtually all the AF SLR cameras available during the period that
the EOS 650 made its debut had utilized body-integral motors for
lens drive and control. But only Canon had the foresight of having
opted for a lens-integral design. Two high-precision motors are
integrated into each of Canon's EF lenses to control lens action
(one for focusing, and one for aperture control). So, Canon was the
first 35mm camera manufacturer to use a entirely new,
electronically-controlled lens mount in which a motor in the lens
moved the diaphragm blades and another one to drive the AF mehanism
for high-speed focusing. This concept has since been adopted by
other manufacturers as well such as Contax N series, Olympus 4/3
Digital System and Sigma's SD9 and SD10 Digital SLRs that employed
Foveon's CMOS sensors.
During the initial stage of the EOS Sysem, Canon used a motor called
"AFD", for Arc Form Drive, a conventional small DC electric motor
that designed in an arc-shape to fit into the barrel for the
majority of their consumer-grade EF lenses. The USM or Ultrasonic
Motor lenses were found in the more expensive L-series professional
grade lenses. USM driven lenses can focus faster than those with AFD.
Inside each of the USM lens, the motors are comprised of two metal
rings, one annexes to the lens barrel while another is connected to
the focusing helical. It uses simple but practical theory to achieve
reliable, efficient and virtually silent operation. Canon has
improved the USM technologies over the years and the latest was the
Micro-USM which had replaced the AFD version on the newer series of
consumer-grade of EF lenses. The latest L-series as well as most of
the midrange type of EF lenses have also been ugraded to the next
generation of USM, which utilize FT-M (Full Time Manual) focusing,
enabling photographers to perform manual focusing adjustment
immediately should the AF operation not able to find focus on the
targetted subject.
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