ivan how about trying this to test ur 30D
put a cartolina at the background the get a glass of water with ice nya pictura with WB of 3200k
[img width=335 height=500]http://img412.imageshack.us/img412/3761/dsc00789resizetf8.jpg[/img]
[img width=335 height=500]http://img103.imageshack.us/img103/7179/dsc01125resizeui6.jpg[/img]
[img width=335 height=500]http://img412.imageshack.us/img412/1908/dsc01091resizeuy3.jpg[/img]
[img width=335 height=500]http://img103.imageshack.us/img103/1783/dsc01113resizewk8.jpg[/img]
[img width=335 height=500]http://img253.imageshack.us/img253/2793/dsc01096resizena2.jpg[/img]
[img width=500 height=335]http://img297.imageshack.us/img297/3257/dsc010762resizext2.jpg[/img]