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Thread: Need solution to filter spectral shift problem

  1. #1

    Default Need solution to filter spectral shift problem

    Hi all. I have a problem using a filter on my zoom lens at wide angle. At low focal lengths ~24mm there is a purple ring around the center of the image. This problem goes away at about 50mm. The ring is annoying and difficult to ps away.

    Lens used is a canon 24-105f4l.

    Any helpful advice is appreciated

  2. #2
    Moderator daredevil123's Avatar
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    Default Re: Need solution to filter spectral shift problem

    Quote Originally Posted by ArchRival View Post
    Hi all. I have a problem using a filter on my zoom lens at wide angle. At low focal lengths ~24mm there is a purple ring around the center of the image. This problem goes away at about 50mm. The ring is annoying and difficult to ps away.

    Lens used is a canon 24-105f4l.

    Any helpful advice is appreciated
    Care to post an image of this ring effect? And do tell use what filter you used in the shot.

  3. #3

    Default Re: Need solution to filter spectral shift problem

    So why not remove the filter? Sounds like a reflection from the lens elements.
    Alpha

  4. #4
    Member enzeru21's Avatar
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    Default Re: Need solution to filter spectral shift problem

    i think you bought a filter that is not too good.. so thats why giving you problem with some light refraction... especially at wide angles... yup.. when you zoom out to 50mm there is less incident light going thru at that part so doesn't give the problem...

    change a filter ba~!
    enzeru21 Canon 500D |Tamron17-50mm f/2.8| Sigma30mm f/1.4 | 580EX II
    mylightedreams

  5. #5

    Default Re: Need solution to filter spectral shift problem

    Apologies for the delay. This is an image from the camera aimed at a more or less uniformly lit surface with said filter attached. The purple ring is not very obvious here but it can get more obvious under certain circumstances.


  6. #6

    Default Re: Need solution to filter spectral shift problem

    Take a pic withut the filter. That looks like a reflection of the front lens element.
    Alpha

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