Im new to SLR camera, whats the mm on lenses on comparisoin to zoom

Discussion in 'Canon FD' started by bob_doroh, Oct 24, 2003.

  1. the lens I have is 50 mm, if I put a 135 mm telephoto lens on it how
    much zoom would that give me approx 2.5? im not clear on this.
     
  2. If you put a 135mm lens on it, it will enlarge things 2.7 times compared to a 50mm. 135/50 = 2.7.

    This assumes normal subjects (not extreme close-ups). And the focal lengths may be rounded off slightly.
     

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