Opteka RL-12 Digital Macro LED Ring Light for Canon EOS, Nikon, Sony Alpha, Olympus and Pentax Digital SLR Cameras Mounts on all 52mm, 58mm, 67mm and 72mm front lens threads Ultra bright high power 12 advanced LED's Ideal for Close-up photography, especially online sales, medical, and scientific applications Provides shadow-free lighting, Color Temperature: 5000K Uses 4 AAA batteries, up to 200 constant minutes - no recharging needed