The author states... "To get this image, I set my lens to autofocus, and with my shutter speed at 1/500 sec., I aimed the camera at the blue sky and adjusted my aperture until the camera meter indicated that f/8 was correct. I then recomposed and shot several rolls over the course of the next fifteen minutes. I'm just really getting a firm grasp on somethings, but I'm not exactly sure what the heck is going on here. I know you guys will be able to bring it down to my noobish level. Thanks for any help.