silicon photocell การใช้

• The Canon EF contained a silicon photocell light meter with a range of shutter speed and the aperture.
• Light metering consisted of full-aperture through-the-lens metering, using a six zone silicon photocell.
• The exposure control system consisted of a needle pointing along a vertical f-stop scale on the right side of the viewfinder to indicate the readings of the built-in light meter ( center-weighted with a silicon photocell ).
• It has a viewfinder exposure information system using a six-digit, seven-segment per digit, red alphanumeric LED display on the bottom of the viewfinder to indicate the readings of the built-in centerweighted, silicon photocell light meter.
• Center-weighted and partial area metering are performed by a double-area silicon photocell ( SPC ) in Canon's standard location above the eyepiece, while spot metering is performed by another SPC located at the bottom of the mirror box.
• Dendritic web silicon photocells were built and tested, and that business was later sold and transferred to Solar Power Industries Inc . of West Newton, Pa . AESD engineers also built a prototype for a magnetohydrodynamic ( MHD ) system utilizing hot plasma gases emitted by a coal-fired power plant.