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Thread: Dumb ZOOM lens question

  1. #1
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    Default Dumb ZOOM lens question

    OK. For a zoom lens there are usually 2 Aperture readngs available on the lens right? Like the following

    28-105MM f2.8-4

    According to what I know, this means the max aperture I can get at 28MM is f2.8 and at 105MM is f4. However, what I do not know is whether I have to switch the aperture physically to f4 when I am using 105MM or will it automatically 'convert' the f2.8 to f4??

    Thank you for bearing with such a stupid question.

  2. #2
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    automatic

    let's say it is in Av mode and u set to f2.8 at 28mm

    when u starts to zoom, u will see the f number slowly increase until f4 @ 105mm
    We are HDD of PC & FT are MB add to storage;
    so PC never hangs with enormous storage capacity - LKY

  3. #3
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    Even though I am using a manual camera? That means I have to remember that at 105MM 2.8 means 4 and so on?

  4. #4
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    Originally posted by Silverelf
    Even though I am using a manual camera? That means I have to remember that at 105MM 2.8 means 4 and so on?
    which camera body?
    We are HDD of PC & FT are MB add to storage;
    so PC never hangs with enormous storage capacity - LKY

  5. #5

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    if u r using the above stated lens on a maunal camera then when u want to shoot wide open at 105mm then u should turn the aperture ring on the lens to f4

  6. #6
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    Originally posted by clive
    if u r using the above stated lens on a maunal camera then when u want to shoot wide open at 105mm then u should turn the aperture ring on the lens to f4
    No need to, when you zoom the thing to 105, the 2.8 mark becomes f/4 automatically.

    Regards
    CK

  7. #7
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    Originally posted by Wai
    which camera body?
    Nikon FM2
    Thanks for all the advice... was wondering about whether I needed to change it physically

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