I've always loved the look in photos where sources of light shoot out rays like multi-pointed stars. I've always thought, wow, that photographer knows what time of day to catch the sun just right like that... or there must be some special filter I don't have. When really, I needed someone to say "let me google that for you." Recently, I got wise and did go to google. Turns out, it's a function of aperture. Who knew? This guy did. The "sweet spot" is between f/8-f/11. On a recent trip to Tilden Park I tried it out and voilà, starbursts! The three below are taken with my 50mm lens set to f/8.0.