Effective Focal Length

Famous quotes containing the words effective and/or length:

“... effective magic is transcendent nature ...”
—George Eliot [Mary Ann (or Marian)

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To merry London, my most kindly nurse,
That to me gave this life’s first native source;
Though from another place I take my name,
An house of ancient fame.”
—Edmund Spenser (1552?–1599)