Sigma 179109 / 179-109 ELECTRONIC FLASH EF-530 DG ST FOR PENTAX The Sigma Corporation is pleased to announce the launch of the new ELECTRONIC FLASH EF-530 DG ST.EF-530 DG ST features a powerful Guide Number of 53 and is designed to work with the latest TTL auto exposure systems of all popular manufacturers.. digital and film SLR cameras. It features TTL automatic flash exposure control for easy operation. The auto zoom 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 level to full or 1/16. When the