1. Sun star through teddy bear cholla. Tucson, Arizona. D800, AF-S 20/1.8G, 1/125s, f/16, ISO 100
2. (Not a sun star, but related!) If you are going to stick your camera into a cholla, these sorts of things happen.
Love the 20/1.8G. It excels at many things, including sun stars and up close. (The 28/1.8G is good for sun stars, too.)