Hello Ocal,
I don't know if I understand you correctly: do you have questions on collimation or do you want to share a tutorial?
As you are situted in Hefei/China and as your user name is "ocal": is it perhaps that your post is of commercial nature and
do you want to introduce the "Electronic Collimator" of Ocal company in Hefei to us?
Regards, Jochen