Polaroid Studio Series 48 Led Macro Ring Light (49/52/55/58/62/67mm) For Canon EOS, Nikon, Sony Alpha, Olympus, Panasonic & Pentax Digital SLR Cameras Continuous shadowless light from 48 LEDs Effective at 1-40" range (2.54-101.6 cm) Six adapter rings (49mm, 52mm, 55mm, 58mm, 62mm, 67mm) included Operates on 2x AA batteries or with included AC adapter