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Thread: What is Exposure Magnification

  1. #1

    Default What is Exposure Magnification

    There are two 1.4x and two 2.0x teleconverters lens in Tamron website.
    the "white" colour have the word Exposure Magnification under their specification.

    Anyone know what Exposure Magnification is for and differences between the white and black teleconverters?

  2. #2
    Moderator ortega's Avatar
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    Default Re: What is Exposure Magnification


  3. #3

    Default Re: What is Exposure Magnification

    well... they do not explain about it on their lens. I only see it on their white teleconverters
    Last edited by XenoPhoto; 9th June 2009 at 12:44 AM.

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    Moderator ortega's Avatar
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    Default Re: What is Exposure Magnification

    i think it is exposure compensation

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    Moderator catchlights's Avatar
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    Default Re: What is Exposure Magnification

    it means the exposure compensation is about two stops for a 2X Exposure Magnification.

    the white version SP AF2X Pro Teleconverter is a pro version. more ex.

    the black version AF2X Teleconverter is a consumer version. cheaper.
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    Deregistered shaoken's Avatar
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    Default Re: What is Exposure Magnification

    If I'm not wrong the the light lost through the tele-converter.

    In most cases, 2x tele-converter will result in -2 stops of light. 1.4x results in about 1.5x light loss.

  7. #7

    Default Re: What is Exposure Magnification

    wow! -1.5 stop is a lot for 1.4x teleconverter
    i thought it will only be -1 stop for 1.4x

  8. #8
    Moderator catchlights's Avatar
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    Default Re: What is Exposure Magnification

    Quote Originally Posted by shaoken View Post
    If I'm not wrong the the light lost through the tele-converter.

    In most cases, 2x tele-converter will result in -2 stops of light. 1.4x results in about 1.5x light loss.
    incorrect.
    decreases the effective aperture by one F-stop (with 1.4x Tele Converter) or by two F-stops (with 2x Tele Converter).
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