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focus control |
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focus control [′fō·kəs kən‚trōl] (electronics) A control that adjusts spot size at the screen of a cathode-ray tube to give the sharpest possible image; it may vary the current through a focusing coil or change the position of a permanent magnet. (optics) A device to adjust a lens system to produce a sharp image. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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