Thanks for your help kevin, but i’ve tried these 2 options already and none seems to work, perhaps I’m doing something wrong ?
I cant’t use camera dof as, unfortunately, I do have other 3d layers that I don’t want to be dof-ed.
I can’t neither pre-compose again my 3d water which is already pre-comped just in order to add a les blur to it because, when I do so, it….. how can I explain… it moves in the wrong place with the wrong scale, it goes in the center of the comp fitting the comp size.