Look Centrosphere, you should be around long enough before you start correcting people and implying that they don't know what they are saying. I started doing black and white darkroom photography centuries ago, I'm an amateur astronomer, I know how photography and optics work. This is not blooming - it's a normal exposure, most likely 1/250th second at f/16 or f/22, onto a special Kodak 70mm thin emulsion specifically designed to minimize unwanted artifacts - it's dirt on the lens, "dirt dirt" as Pete Conrad called it.