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Thread: Hello! Newbie here!

  1. #1

    Default Hello! Newbie here!

    hi all, i'm new to the world of photography. hope to learn alot more in this forum...
    My camera is Canon 400D with lens 18-55mm IS.
    I have a question...my lens lowest f is 3.5. However, the lowest f i can get is 5.0. Why is it so?

  2. #2

    Default Re: Hello! Newbie here!

    Hi and welcome.

    F stop 3.5 should refer to when the lens is at 18mm.
    For 5.0, i believe your lens is at a different zoom setting?

  3. #3
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    Default Re: Hello! Newbie here!

    hi..
    warm welcome by a CS fan..
    i don't know which shooting mode you are using but if you want to make your aperture 3.5, you shoud use 18mm zoom end

  4. #4

    Default Re: Hello! Newbie here!

    ooooh.....thanks for the replies guys!
    now i get it!
    does this means that for every lens, you only can get the lowest f at the shortest focal length?

  5. #5

    Default Re: Hello! Newbie here!

    Quote Originally Posted by reistarz View Post
    ooooh.....thanks for the replies guys!
    now i get it!
    does this means that for every lens, you only can get the lowest f at the shortest focal length?
    Yes, that is generally true for zoom lenses.

    There are, of course, constant aperture lenses. For instance, a f/2.8 70-200 (A common Canon and Nikon lens) has a largest aperture of f/2.8 at every focal length.

  6. #6

    Default Re: Hello! Newbie here!

    Quote Originally Posted by Blur Shadow View Post
    Yes, that is generally true for zoom lenses.

    There are, of course, constant aperture lenses. For instance, a f/2.8 70-200 (A common Canon and Nikon lens) has a largest aperture of f/2.8 at every focal length.
    icic...now i know thanks!

  7. #7
    Moderator catchlights's Avatar
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    Default Re: Hello! Newbie here!

    Quote Originally Posted by reistarz View Post
    ooooh.....thanks for the replies guys!
    now i get it!
    does this means that for every lens, you only can get the lowest f at the shortest focal length?
    there are fixed aperture zoom lens or some call it constant aperture zoom lens, which the aperture value is same thru out all the different focal length.

    yours is belong to the variable aperture zoom lens, the aperture value will change at different focal length.

    btw, the fixed aperture zoom lens are much more expensive than variable aperture zoom lens.

    Hope this help.
    Last edited by catchlights; 31st October 2008 at 09:42 AM.
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  8. #8

    Default Re: Hello! Newbie here!

    Quote Originally Posted by catchlights View Post
    there are fixed aperture zoom lens or some call it constant aperture zoom lens, which the aperture value is same thru out all the different focal length.

    yours is belong to the variable aperture zoom lens, the aperture value will change at different focal length.

    btw, the fixed aperture zoom lens are much more expensive than variable aperture zoom lens.

    Hope this help.
    yes. it definitely helps! thanks alot!

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