thanks for the informations.
i am going to do the tests as soon as possible
unfortunatly i did not save my setup on sa memory stick. and i am not sure if the DCC was on or off. but anyway, i am going to do the tests as soon as possible. and i will tell you what happens to me.
by the way when that problem occured, not all the highlight zone had the problem. only one part of it. there were brighter zones of the sky that did not have the noise problems.
+++ if you know an internet site where i can get the user's manual for the camera (a .pdf file or something like that) it would be great because there are some menus that i still don't know.
thanks again for your help.
i will give you the results of the test as soon as i do the next HD shoot.