Thanks a Lot!! In fact I want to pick the stars that might be around in the field. And I could compare to a star map as Stellarium, for example. And really define the field of view of that picture, as I do not remember the F I used, (Lens :50mm-70mm). There is small blues points in the upper part but how to decide if it is a false or true star?, the three small blue points are actual starr, but if you zoom the image more blueish points come to view. I did some filtering and I am adding a new image of the pic.