Brand: O-flash. Model: F170 100% brand new and high quality. Produced by traditional, expensive, and heavy powered studio ring flash units. The most best tools for macro photography. Portable and lightweight, has been designed to take advantage of a camera’s TTL metering capabilities. Contains no electronics, no flash tubes and requires no cumbersome cables. The light distribution is accomplished through a sophisticated system of internal prisms, reflectors and light-shapes designed to distribute and project the light evenly around the lens. TTL functions will work normally when using this O-Flash. Compatible with: Canon 580EX/580EX Ⅱ with 5D/40D/30D/20D/10D.