Photojojo has a link to a DIY Lens Hood printable that lets you save yourself twenty bucks. Photojojo says, “Lens hoods, those round plastic rings that sit at the end of your SLR’s lens, are great at preventing lens flare and unwanted reflections when shooting in sunlight. Just look up your Canon, Nikon, Olympus, Pentax, Sigma, Tamron, or Tokina lens, print out the corresponding lens hood, fold it up, and slap it on. They even fold back up to make ’em easier to carry around!” Link.
Printable DIY Lens Hoods