[jsmoraes (Jorge)]

Sory, but I didn't understand well your problem. Let's see: 1) you have problem with focus 2) you are using PHD 2 to guide 3) your are trying to adjust the focus of guide camera with PHD 2.
If I understood well, your error is to use PHD 2 to adjust the focus. PHD hasn't good image of a star. For PHD the most importance is the movement of a star. Therefore it saturate and clip the image to have the star on the screen.
Try to focus the star with another program, and only after this adjustment active PHD for guinding task.

note: the image of screen with a star inside by PHD 2 is something more than worse. It is terrible ! Trash ! And that is normal, because PHD is to guiding task, not to capture image.
The saved file is FIT. You need some program to open this kind of file.

See the PHD image that I saved at 02/11/2014 . I didn't use dark file. I used noise filter 3x3 to clean the image. The photo is without action of filter. Let's go to play: Where is Wally ?