An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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focal reducer
  کاهنده‌ی ِ کانونی، باز‌هازنده‌ی ِ ~  
kâhande-ye kânuni, bâzhâzande-ye ~
Fr.: réducteur focal  

An optical component or system for changing the image scale of a telescope to achieve a better match between the → seeing disk and the → pixel size.

See also: → focal; → reducer.