DPSSFD (diode pumped solid state frequency-doubled) or better known as a green laser pointer. This photo was inspired by my friend Jeff Carr and his blog post entitled "High Energy" from last week. I experimented with firing my green laser at the camera and capturing the image. Because a green laser is much more powerful than a red laser, I waved the laser at the lens at a sharp angle while firing the shutter multiple times. I didn't want the laser shooting straight at the camera's sensor because of the intensity of the light. I certainly wouldn't recommend this technique because the risk to eyes and camera. The circles of green result from the beam refracting off the many glass elements inside of the lens. Canon 40D, 1/60 sec @ f/2.8, ISO 800, 17-55mm zoom lens at 17mm.