I think of every photo as a portrait - an effort by the photographer to portray a subject to an audience. The success of that effort depends on the reaction of the audience. You just made it unmistakeably clear that your image is a big success, even though you can see technical issues in it. The connection that the image makes for you, you to your father as he views a connection to his father, overrules any technical issues.
There are many of us who'd give anything to be able to take a photo of Dad today, and all of us can understand the value to you of this photo.
Sometimes the technical issues just aren't important.