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The Sigma EM-140 DG Ring Flash is ideal for photographing subjects in fine detail - close-up photography - and is extremely effective for scientific and medical applications.
Dual flash tubes can fire simultaneously or separately. Using only one flashtube creates modeling, which can give a three-dimensional feeling to the subject. The Modeling Flash function makes it possible to check for reflections and shadows before actually taking the flash picture.
A wireless flash function is also available, where the EM-140 DG is used as master and the EF-500 DG Super as a slave unit for creating fine shadow details. High Speed Synchro functions are also available for advanced flash photography.
All digital cameras are compatible with the following features. Certain of these features depend on support from the camera, please click here for a camera/flash function compatibility chart.
Fully dedicated with P-TTL with Pentax and Samsung cameras
Wireless TTL flash control (4 channels)
High Speed Synchro flash
Stroboscopic effect (power level and frequency customizable)
Modeling light, also provides AF assist
Backlight illuminated LCD panel
46' (14 m)
Number of Flashes
Max Usable Diameter Size
Angle of Coverage
Yes; Full, 1/2, 1/4, 1/8, 1/16, 1/32 & 1/64
Yes; P-TTL, TTL
6 seconds with alkaline batteries 4 seconds with NiMH batteries