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Changes lens size?

Discussion in 'General Discussion' started by joecool_c1, Jul 4, 2008.

  1. joecool_c1

    joecool_c1

    865
    Jun 20, 2008
    canada
    This is just going to be a quick vauge post, since im in a hurry, but i hope that i get enough out there that everyone understands and can answer.

    i was listening to a video and i think it was about the D80, it said something like a 18-55mm lens ends up actually being something like 27-82mm, because of the sensor size, like 1.6x greater. Can someone explain this for me or something. thanks :) 
     
  2. The focal length of the lens does not change, it's the field of view that changes. This is due to the majority of the 'consumer' DSLR's being fitted with sensors that are smaller than the 'full-frame' 35mm area.
    Only the centre part of the image circle is used.

    whyhan's link explians it pretty well...
     
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