The Zeikos Digital TTL Macro Ringlight Flash for Canon cameras is a circular light source which delivers, evenly balanced, shadowless lighting that is ideal for macro, portraits, products, medical and technical applications. It has a Guide Number of 16(m)/ 52(ft) and features full automatic TTL flash exposure control. When shooting at extremely short distances, relatively minor changes in the lighting or the subject can result in relatively large change in the required exposure. TTL metering and the automatic shutter speed setting eliminate the need for lengthy calculations of exposure.
Other useful features include: second/rear curtain synchronization, infra-red autofocus assistance beam, red eye reduction, and an auto check indicator. The ringlight attaches to a lens with the included 52,55,58, or 62mm adapter rings.