Playmont Macro Ring Light Kit + Macro Extension tube set + Hot shoe Adapter, for Sony Alpha Series SLT-A3 The Ring Light Continuous, Not Flash, Lighting Direct Shadowless Light The Ring Light is Effective at 1-40" range (2.54-101.6 cm) The ring light one of the best sources for close up photography. And that makes the macro LED ring light the perfect choice for photographers who require shadow free illumination - perfect for medical scientific and forensic photography. great for dental photos, insects, flowers, coins, stamps, etc. Includes six adapter rings to fit a range of lens diameters: 49, 52, 55, 58, 62, and 67mm. The Extension Tube Set Will not alter optical quality The Manual Extensions Tube Set allows your lens to focus closer than its normal minimum focusing distance. By placing distance between your camera body and lens, the focusing distance is shortened and magnification is increased. Extension tubes enable macro performance for lenses not otherwise able to focus that close, and are also suited for close-up portraiture.