Not to re-open a closed case, but here's another thought - what happens if you throw a polarizer on the lens? In theory it should "straighten" the beams of light and eliminate the effects of diffraction, right?
If you want to understand light, take a course in physics. Freshman level maybe?
Or get a physics text book ... no, do a course - a good book should be a requirement for the course. Reading CR is not a substitute for doing a course on this if you really want to understand it.
He asked a simple question. If you can´t answer his question or add to it, stay off.
For you I can recommend a book on simple politeness. Freshman level might be to advanced thought ...
He did not ask for a rude reply from an incompetent jerk. Spread your garbage someplace else!
Or, alternatively, start posting images and show us that behind this rude alias, there is one who knows where the view finder on a camera is. I for one have not seen a single image for you, so I believe you haven´t shot a single decent image in your life. So until I see someone comment on your images, you will remain on my list of ignored posters.