Meike FC100 Macro Ring Flash LED for Canon Nikon Pentax Olympus DSLR Camera Camcorder with Adapter Rings Works with Canon Nikon Pentax Olympus Micro 4/3 DSLR camera Meike FC-100 has Light mode,Flash mode,L mode(Left half of the annular flash),R mode,4 different lighting modes Equipped with 52mm, 55mm, 58mm,62mm, 67mm, 72mm 77mm adapters,compatible for lens in different size Featuring an exposure time of 1/100 seconds It is designed for close up, macro, medical, scientific and forensic photography as the flash light source is positioned directly between the camera lens and subject providing an even illumination