Colour Filter to remove Sigma's warm colour cast?

[Wisdomworld]

Just wonder anyone tried doing it? Maybe with the following filters to balance the warm colour cast of Sigma lenses.

http://www.thkphoto.com/products/hoya/cf-04.html

 

[OlyFlyer]

Just wonder anyone tried doing it? Maybe with the following filters to balance the warm colour cast of Sigma lenses.

http://www.thkphoto.com/products/hoya/cf-04.html

I don't know, but is there any idea to use it? Isn't it better to fix white balance problems in the camera or computer? Personally I have no Sigma and don't know if it is needed at all to correct warm colour cast, but IMO it is easily done in PS or during RAW development.