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Thread: Close up filter

  1. #21
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    Default Re: Close up filter

    is there any better grade close up filter? am using a +4 cheapo filter to try try...and notice it got some CA.

  2. #22
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    Default Re: Close up filter

    Quote Originally Posted by dxsibo View Post
    is there any better grade close up filter? am using a +4 cheapo filter to try try...and notice it got some CA.
    Best is the +10. But prepare to pay premium for it.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  3. #23
    Senior Member giantcanopy's Avatar
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    Default Re: Close up filter

    U pay more for better close up filters. It is not just a matter of getting a +10 is better than getting a +4 etc. Cheap single element ones can significantly degrade the IQ especially at the corners. Those with dual elements or more / special coatings give better IQ.


    Examples include the Canon 500D, their 250D, the ( discontinued ) Nikon T series, zoerk makes a high quality +12 filter.

    Ryan

  4. #24

    Default Re: Close up filter

    what does the +(insert number) mean? how to make it 1:1 using the close up filters?

  5. #25
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    Default Re: Close up filter

    Quote Originally Posted by has91 View Post
    what does the +(insert number) mean? how to make it 1:1 using the close up filters?
    That's the dioptric magnification.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  6. #26
    Senior Member giantcanopy's Avatar
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    Default Re: Close up filter

    You get the focal Length of lens divided by focal length of close up filter to get magnification
    ( focal length of the diopter is 1000 / diopter (+) )

    Hence a 50mm lens with a +10 dioptre gives
    50mm / ( 1000 divide 10 ) = 50% magnification

    Different lenses give different reproduction ratios.
    U stack a 2+ with a 105mm macro lens, and u can go past 1:1,
    but u stack a 2+ with a non macro 105mm with low reproduction ratio, u might not even reach 1:1

    To gain 1:1 for any particular lens u will have to find out and do abit of calculation backwards ...

    Ryan
    Last edited by giantcanopy; 3rd April 2009 at 04:15 PM.

  7. #27

    Default Re: Close up filter

    ok one last noob questions. lol. so 1:1 means 100% magnification?

  8. #28
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    Default Re: Close up filter

    Quote Originally Posted by has91 View Post
    ok one last noob questions. lol. so 1:1 means 100% magnification?
    1:1 means life-size.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  9. #29
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    Default Re: Close up filter

    Quote Originally Posted by ngck12 View Post
    close up is not macro.
    so basically whats the difference between these two lenses?
    also the difference from telefoto lens.

    thanks
    "wisdom is not measured by the knowledge you know, but the knowledge you have"
    forever newbie: D60

  10. #30

    Default Re: Close up filter

    Quote Originally Posted by sanas View Post
    so basically whats the difference between these two lenses?
    also the difference from telefoto lens.

    thanks
    Any close up filter that is less than +10 diopter is known as a close up filter. Only +10 diopter and above filters are known as macro filters.

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