long shot

  1. Informal
    1. in betting, a choice that has only a slight chance of winning and, hence, carries great odds
    2. any venture with only a slight chance of success, but offering great rewards if successful
  2. Film, TV a scene shot with or as with the camera at some distance from the subject or action

See long shot in American Heritage Dictionary 4

noun
  1. An entry, as in a horserace, with only a slight chance of winning.
  2. a. A bet made at great odds.
    b. A venture that offers a great reward if successful but has very little chance of success.
  3. A photograph or a film or television shot in which the subject is shown at a relatively small scale.

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