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Thread: How to use an Extension tube

  1. #1
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    Default How to use an Extension tube

    hi guys im just wondering how do i use the extension tube? i dont get how the mm works

  2. #2
    Moderator Octarine's Avatar
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    Default Re: How to use an Extension tube

    Between lens and body?
    Have a look at our macro section here. They have sticky threads and other guides.
    EOS

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    Default Re: How to use an Extension tube

    Quote Originally Posted by Octarine View Post
    Between lens and body?
    Have a look at our macro section here. They have sticky threads and other guides.
    i wanna know what does eat focal length of the extension do? and must i always use 3 of them? im using the kenko extension tube set

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    Senior Member shierwin's Avatar
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    Default Re: How to use an Extension tube

    Google "How to use an Extension tube" found this link:

    http://www.youtube.com/watch?v=SwgbYaB2jqI

    Additional link for reference (Teleconverter vs Extension tubes):

    http://www.youtube.com/watch?v=i3ZpSA7e5ww
    Last edited by shierwin; 22nd February 2014 at 05:17 PM.

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    Default Re: How to use an Extension tube

    Quote Originally Posted by shierwin View Post
    Google "How to use an Extension tube" found this link:

    http://www.youtube.com/watch?v=SwgbYaB2jqI

    Additional link for reference (Teleconverter vs Extension tubes):

    http://www.youtube.com/watch?v=i3ZpSA7e5ww
    alright thanks very much

  6. #6

    Default Re: How to use an Extension tube

    Quote Originally Posted by eys123 View Post
    i wanna know what does eat focal length of the extension do? and must i always use 3 of them? im using the kenko extension tube set
    No you don't have to use all three. They come in 3 different lengths so you get can different magnification setups. You can use 1, 2 or all 3 of them together.

    The length markings are not 'focal lengths'. They are physical lengths of each tube. Optics theory says you get 1:1 magnification when you are at 2f or 2 x focal length. So extending a 28mm lens by 28mm will give you 1:1 magnification (with the lens focused at infinity). Extending it more will increase the magnification, reducing extension will reduce magnification. Increasing magnification also results in a smaller effective aperture, darker screen image, perhaps leading to AF issues.

  7. #7

    Default Re: How to use an Extension tube

    Anyone use extension tube set for Sony NEX Camera?

  8. #8
    Moderator Octarine's Avatar
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    Default Re: How to use an Extension tube

    Quote Originally Posted by Alejandro000 View Post
    Anyone use extension tube set for Sony NEX Camera?
    The same question in two diffrent threads? Please don't cross post
    Equipment specific questions (Sony) are best asked in the respective equipment forums.
    EOS

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