F# in lense description...

Discussion in 'Beyond the Basics' started by Gandalf, Nov 17, 2004.

  1. Gandalf

    Gandalf TPF Noob!

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    Hey everyone, this is a fairly simple question, but one that has been bugging me for awhile

    What exactly does the F/# mean in the description of camera lenses?

    Take this one for example:
    http://www.adorama.com/CA702004AFU.html

    It says Canon EF 70-200mm f/4L; some say f/5.6, some say f/4-5.6, but what exactly does that mean?

    What # is more desirable?
     
  2. SWFLA1

    SWFLA1 TPF Noob!

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  3. Gandalf

    Gandalf TPF Noob!

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    Ah ok, thanks for the link, I think I understand the number now! :)
     

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