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Thread: Question about lens' specs

  1. #1

    Default Question about lens' specs

    Hi all,

    I've got some noob questions on understanding a lens specifications.

    Q1: Say for lens like EF 70-200mm f/2.8L IS USM, does it mean the f/2.8 is the highest aperture value the lens can go?

    Q2: For EF 70-300mm f/4-5.6 IS USM, what does "f/4-5.6" mean? That the max f value is variable?


    Many thanks

  2. #2
    Senior Member zac08's Avatar
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    Default Re: Question about lens' specs

    Quote Originally Posted by cancan7 View Post
    Hi all,

    I've got some noob questions on understanding a lens specifications.

    Q1: Say for lens like EF 70-200mm f/2.8L IS USM, does it mean the f/2.8 is the highest aperture value the lens can go?

    Q2: For EF 70-300mm f/4-5.6 IS USM, what does "f/4-5.6" mean? That the max f value is variable?


    Many thanks
    1) Yes, largest aperture is f2.8 throughout the zoom range.

    2) This means the largest aperture of f4 is only applicable to 70mm + a lil before it stops down accordingly to f5.6 at the zoom end of 300mm.
    Michael Lim
    My Flickr Site

  3. #3

    Default Re: Question about lens' specs

    thanks for enlightening me!

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