Sigma Corporation, a world-known Japanese manufacturer of photographic equipment, has released a new version of their entry level flash gun. The new Sigma EF-610 DG ST flash replaces the older Sigma EF-530 DG ST. The most significant difference is light output. Sigma EF-610 DG ST has a guide number of 61 (61m/200ft at ISO 100 and zoom 105mm), which is a big leap forward from the previous guide number of 53.
The main features include:
Please find the the official press release below.
Also read: Sigma EF-610 DG Super flash release
Press release:
The Sigma Corporation is pleased to announce the launch of the new ELECTRONIC FLASH EF-610 DG ST. The EF-610 DG ST features a powerful Guide Number of 61 and is designed to work with the latest TTL auto exposure systems of all popular digital and film SLR cameras.
It features TTL automatic flash exposure control for easy operation. The autozoom function automatically sets the optimum illumination angle in accordance with the lens' focal length in a range from 24mm to 105mm. When the built-in Wide Panel is used, the flash can cover the angle of 17mm. For bounce flash, the flashgun head can be tilted up by 90 degrees, to the left by 180 degrees, or to the right by 90 degrees. It can also be tilted down by 7 degrees allowing ease of use for close-up photography. In addition to automatic mode, the flashgun also features a manual flash mode, making it possible to set the flash power to full or 1/16. When the flashgun is fully charged, a confirmation 'ready' light will be emitted and the flash exposure level can be checked through the camera's viewfinder. Other features incorporated into this flashgun include the Auto Power-Off function to help save battery power.