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Thread: Filters

  1. #1

    Default Filters

    Can someone give me a quick education on filters?

    I have a 77mm CPL and ND4 and of course the normal UV ones.

    What does CPL and ND4 do?
    CPL is to take the sun so that it will not be so glaring?

    ND4 is to cut down by 4 stops? So as to take through glass?

    What about GND?

    If I got a high contrast scene and I don't want to do bracketing (lazy), do I need to use GND?

  2. #2

    Default Re: Filters

    Your understanding of filters is all off. ND4 to take thorugh glass???

    Have you done any basic research? Your question is covered about 50x here on CS, and about 200x all over the web. Please try a search on google for "photographic filters" and read up a bit.
    Alpha

  3. #3
    Senior Member ZerocoolAstra's Avatar
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    Default Re: Filters

    Quote Originally Posted by shelomoh View Post
    Can someone give me a quick education on filters?

    I have a 77mm CPL and ND4 and of course the normal UV ones.

    What does CPL and ND4 do?
    CPL is to take the sun so that it will not be so glaring?

    ND4 is to cut down by 4 stops? So as to take through glass?

    What about GND?

    If I got a high contrast scene and I don't want to do bracketing (lazy), do I need to use GND?
    difficult to give you a quick education on filters, I'm afraid...

    as an initial step, try to google for the different terms 'CPL filter', 'GND filter', 'ND4 filter' and see what you get.
    After reading them you should have some idea...

    You're going for the wednesday outing, right? I can talk to you about it then.
    Exploring! :)

  4. #4
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    Default Re: Filters

    ND: http://en.wikipedia.org/wiki/Photogr...eutral_density
    CPL: http://en.wikipedia.org/wiki/Polariz...Photography%29

    And ND8 is 3 stops. Its call ND8 because 2^3 = 8 and your exposures need to be 8 times as long.

  5. #5

  6. #6

    Default Re: Filters

    so for my lens 18-55mm cani buy a uv filter which is 58mm? would it fit? or i must buy one that is 55mm?

    thanks!!

  7. #7
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    Default Re: Filters

    Quote Originally Posted by thewickedgirl View Post
    so for my lens 18-55mm cani buy a uv filter which is 58mm? would it fit? or i must buy one that is 55mm?

    thanks!!
    Get the size of the filter that corresponds with your lens diameter. (not the focal length)

  8. #8

    Default Re: Filters

    Quote Originally Posted by thewickedgirl View Post
    so for my lens 18-55mm cani buy a uv filter which is 58mm? would it fit? or i must buy one that is 55mm?

    thanks!!
    The filter thread size is on the front of the lens.
    Alpha

  9. #9

    Default Re: Filters

    Quote Originally Posted by ZerocoolAstra View Post
    difficult to give you a quick education on filters, I'm afraid...

    as an initial step, try to google for the different terms 'CPL filter', 'GND filter', 'ND4 filter' and see what you get.
    After reading them you should have some idea...

    You're going for the wednesday outing, right? I can talk to you about it then.
    I did google but different sites use different terms ... like polarisers = CPL??? ND = ND4/ND8 or GND??? So got confused.

    Yup catch up with you on Wednesday.

  10. #10
    Moderator Octarine's Avatar
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    Default Re: Filters

    Quote Originally Posted by shelomoh View Post
    I did google but different sites use different terms ... like polarisers = CPL??? ND = ND4/ND8 or GND??? So got confused.
    Yup catch up with you on Wednesday.
    What have you done all the other 220 postings here? never found the countless repeating postings about filters?
    Camera Lens Filters
    Read photographic websites, not some marketing gibberish, the terms used are standardized.
    Last edited by Octarine; 10th May 2010 at 08:10 PM.
    EOS

  11. #11

    Default Re: Filters

    Quote Originally Posted by shelomoh View Post
    Can someone give me a quick education on filters?

    I have a 77mm CPL and ND4 and of course the normal UV ones.

    What does CPL and ND4 do?
    CPL is to take the sun so that it will not be so glaring?

    ND4 is to cut down by 4 stops? So as to take through glass?

    What about GND?

    If I got a high contrast scene and I don't want to do bracketing (lazy), do I need to use GND?
    You're almost there. It's almost the other way around.
    CPL allow you to take through glass at a certain angle.
    ND4 cut down by 2 stops - in a way, if the sun is bright and glaring, you can use the ND4 to dim it.
    Don't think bracketing will help with a high contrast scene, depending on the scene, a GND would be useful.

  12. #12

    Default Re: Filters

    Quote Originally Posted by thewickedgirl View Post
    so for my lens 18-55mm cani buy a uv filter which is 58mm? would it fit? or i must buy one that is 55mm?

    thanks!!
    Get a set of step-down rings. These are useful if you are using your filters on more than 1 lens.

  13. #13

    Default Re: Filters

    Quote Originally Posted by krazyman View Post
    Get a set of step-down rings. These are useful if you are using your filters on more than 1 lens.
    okay thanks everyone

  14. #14

    Default Re: Filters

    TS I think u need to take a step back... clam down n not fall into the buy buy buy syndrom.. u seem to be wanting to buy all these diff filters w/o even knowing why and how to use them and what to get. just don't worry so much abt filters first and start shooting more. ND, GND, CPL filters are not filters that u'd use everyday unless u really specialise in certain types of photography

  15. #15
    Moderator Octarine's Avatar
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    Default Re: Filters

    Quote Originally Posted by krazyman View Post
    Get a set of step-down rings. These are useful if you are using your filters on more than 1 lens.
    That's rather for the expensive CPL filters. Usually, UV filters are purchased per lens in the respective size.
    EOS

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