Well the filter arrived so I to 4 photographs of a non descript view from the garden:
1 Auto WB
2Custom WB
3Cokin ND4 auto WB
4Cokin ND4 custom WB
All were shot in RAW then saved as jpeg with no other modifications.
The question remains the same do Cokin filters produce an unacceptable or uncorrectable colour cast, to me No.
To be more scientific perhaps a range of filters from different manufacturers should be tried.
What does everyone think!
[URL="http://[IMG]http://i571.photobucket.com/albums/ss153/amoret2009/DSC_0015_0486.jpg[/IMG]"]
[URL="http://[IMG]http://i571.photobucket.com/albums/ss153/amoret2009/DSC_0016_0487.jpg[/IMG]"]

I hope I have done this correctly and the results are worth comment
1 Auto WB
2Custom WB
3Cokin ND4 auto WB
4Cokin ND4 custom WB
All were shot in RAW then saved as jpeg with no other modifications.
The question remains the same do Cokin filters produce an unacceptable or uncorrectable colour cast, to me No.
To be more scientific perhaps a range of filters from different manufacturers should be tried.
What does everyone think!
[URL="http://[IMG]http://i571.photobucket.com/albums/ss153/amoret2009/DSC_0015_0486.jpg[/IMG]"]
[URL="http://[IMG]http://i571.photobucket.com/albums/ss153/amoret2009/DSC_0016_0487.jpg[/IMG]"]

I hope I have done this correctly and the results are worth comment