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Thread: How come telephoto part of a zoom lens has shallower DOF?

  1. #21
    Member
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    Default Re: How come telephoto part of a zoom lens has shallower DOF?

    Quote Originally Posted by sf_kang View Post
    Not practical to do an indepth technical explanation here. Suggest you look up this link
    http://en.wikipedia.org/wiki/Depth_of_field
    Fred
    Alright matey, thank you.
    Canon EOS 550D. 18-55mm. 50mm f/1.8 II.

  2. #22
    Senior Member Diavonex's Avatar
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    Default Re: How come telephoto part of a zoom lens has shallower DOF?

    Depth Of Field is affected by:

    1. Aperture

    2. Subject distance

    3. Focal length

    4. Sensor format

  3. #23

    Default Re: How come telephoto part of a zoom lens has shallower DOF?

    Quote Originally Posted by SamTac View Post
    Bigger F number = deeper DOF?

    Smaller F number = shallower DOF?
    sorry...bigger number = shallower DOF.


  4. #24
    Senior Member ZerocoolAstra's Avatar
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    Default Re: How come telephoto part of a zoom lens has shallower DOF?

    Quote Originally Posted by ZerocoolAstra View Post
    errrr... because DOF is also a function of focal length?
    Quote Originally Posted by giantcanopy View Post
    Actually in the instance if the apertures were the same, a telephoto lens will have the same dof as a wide lens.

    http://www.clubsnap.com/forums/newre...eply&p=6578893

    http://www.cambridgeincolour.com/tut...h-of-field.htm

    Ryan
    ahhh thanks for the correction.
    Yes it didn't occur to me that I'm technically incorrect.
    It's because when using telephoto lenses, the subject tends to occupy more of the frame, hence affecting other parameters which in turn affect DOF.
    Exploring! :)

  5. #25

    Default Re: How come telephoto part of a zoom lens has shallower DOF?

    Video Unplayable

    watch this for explanation and illustration.

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