Thank you sunnyday.
To be able to do an appropriate collimation I wrote a little python script that give me histograms of elongation and eccentricity of stars on a 3x3 regions of image.
Unfortunately process is very slow so I had to move collimation and adjust it by eye going back and forth from the primary and secondary and after two hours of work I made some pics and ran the script to see the result of my manipulations. This little tool helped me a bit. And 2x2h were enough to get a quite good collimation.
I am looking for someone that could help me to speed up the process such it can be used along with adjustments.
If there is voluntaries or suggestions ...