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Thread: Macro Filter VS Close-up Filter?

  1. #1
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    Default Macro Filter VS Close-up Filter?

    Hi all, i would like to know wat is the :

    1) difference between a close up filter and a macro filter.

    2) number behind a close up filter (eg. +4)

    3) how to use them?

    any website i can refer for more information?
    thanks guys, please help me clear my doubt.

  2. #2
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    close up filter +4 means it has a diopter rating of +4
    if u are talking abt it in hoya terms
    macro filter is actually a close up filter with diopter rating of +10

    arhmm can try a few books at orchard library, the photography section, got a few good books on macro photography which also touches quite a bit of close up and macro filters.

    essentially they help reduce the minimum focusing distance between the object and ur lens.

    can give u a few links, hope it helps

    http://www.livingroom.org.au/photolo...hotography.php
    Macro Digital Photographyhttp://homepages.ihug.com.au/~parsog/photo/macro.html
    Macro Photography for Beginners

    first links contains more links, din really explore much

    second link is the site that got me into macro photography

    hope it helps
    good luck

  3. #3

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    Quote Originally Posted by aspire
    1) difference between a close up filter and a macro filter.

    2) number behind a close up filter (eg. +4)

    3) how to use them?
    1) They are the same, dfferent vendor calls them differently.


    2) 3)
    FL = focal length
    CU = Close Up
    Diopters are the optical strength of the CU lens. Its focal length can be calculated by using FL = 1000/Diopters. This is also the distance that will now be in focus when the lens is focused at infinity. (A +2 diopter will bring a subject at 1/2 metre {500mm} away into focus.)

    To estimate minimum focus distance convert the camera lens minimum distance to diopters and add it to the CU lens strength. So a +2 CU lens used with a lens that focuses to 1 metre will act (approximately) like a +3 CU lens and bring a subject at 1/3 metre into focus.

    Another approach is to calculate magnification. Convert the diopter strength to millimeters focal length (CU FL = 1000/Diopters). Then divide the camera lens FL by the CU lens FL to get the magnification when the lens is focused at infinity. Thus a +2 CU is 500mm FL. If you use it on a 50mm lens you will get 1:10 life size. The same +2 on a 300mm lens will give you 0.6 of lifesize (1:1.66).


    Useful Links
    http://xoomer.virgilio.it/ripolini/Close_up.htm
    http://www.toledo-bend.com/gallery/i...equest=diopter
    http://www.angelfire.com/ca/erker/closeups.html
    Last edited by megaweb; 29th November 2004 at 08:56 AM.
    See my Photo Gallery at the Clubsnap

  4. #4
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    Default

    thanks guys, sounds kinda chim to me... haha
    looking hard. i like to see things closly haha... guess its studying time!!! =)

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