page_title: Canon T90
section_title: Power features
hierarchical_section_title: Canon T90 / Power features
caption_attribution_description: Canon T90 single-lens reflex camera.
context_page_description: The Canon T90, introduced in 1986, was the top of the line in Canon's T series of 35 mm Single-lens reflex cameras. It is the last professional-level manual-focus camera from Canon, and the last professional camera to use the Canon FD lens mount. Although it was overtaken by the autofocus revolution and Canon's new, incompatible EOS after only a year in production, the T90 pioneered many concepts seen in high-end Canon cameras up to the present day, particularly the user interface, industrial design, and the high level of automation.
  Due to its ruggedness, the T90 was nicknamed "the tank" by Japanese photojournalists. Many have still rated it highly even 20+ years after its introduction.
context_section_description: The T90 includes an integral motor driven film advance, focal plane shutter, mirror and aperture cocking and rewind functions. Canon broke new ground with the powered features of the camera. Previously, cameras used one powerful electric motor geared to all functions. Instead, the T90 has three coreless micromotors within the body, close to the functions they drive, for maximum mechanical advantage. One is used to wind the film, achieving a rate of 4.5 frames per second. A second prepares the shutter, mirror etc. for the next shot. A third motor powers the rewind function. All of this is driven by four AA batteries in the base of the camera.
  To control the camera's systems, the T90 uses a dual CPU architecture. The main, low-power CPU runs at 32 kHz while the sub-CPU runs at 1 MHz, and is powered down when not needed. The main CPU handles the LCD display and overall state, while the sub-CPU handles exposure calculations, viewfinder display, and control of the camera's motors. This architecture provides for lower power usage. Both CPUs, plus other integrated circuits and components, are mounted on several flexible circuit boards that fit around the camera's structure.
  A coin-type lithium battery on the main circuit board retains camera settings when the AA batteries are removed. This is not a user-serviceable part, and when it fails the camera has to be brought to a service center where the battery can be replaced by a Canon technician. Expected battery life is on the order of five years, although this depends on a variety of factors including the duration of periods without main battery (4xAA) power.
caption: Rear, showing film path, shutter
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