home *** CD-ROM | disk | FTP | other *** search
/ The Epic Interactive Encyclopedia 1998 / Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso / F / F_number / INFOTEXT < prev   
Text File  |  1992-09-02  |  197b  |  6 lines
  1. Measure of the relative aperture of a
  2. telescope or camera lens; it indicates the
  3. light-gathering power of the lens. In
  4. photography, each successive f number
  5. represents a halving of exposure speed.
  6.