Sigma announces the EM-140 DG electronic macro flash, fully dedicated with new TTL flash control systems of all popular camera manufacturers.

Sigma Press Release

ELECTRONIC FLASH MACRO EM-140 DG is designed to work with both AF 35mm film and Digital SLR cameras of all the popular manufactures. The EM-140 DG Flash is ideal for photographing subjects in fine detail when the shadowless mode is used and is extremely effective for scientific and medical applications. Dual flash tubes can fire simultaneously or separately. Using only one flashtube creates shadow, which can give a three-dimensional feeling to the subject. The flash features a guide number of 14 w/ISO 100.

Compatible Cameras
SA-STTL (SIGMA), EO-ETTL (CANON),MA-ADI (MINOLTA),
NA-iTTL (NIKON), PA-PTTL (PENTAX)

Compatibility with AF Cameras, click here

ELECTRONIC FLASH MACRO EM-140 DG
MACRO FLASH ADDAPTER (55mm, 58mm) included

1. Designed to work with new Digital SLR cameras

ELECTRONIC FLASH MACRO EM-140 DG is fully dedicated with new TTL flash control systems of all-popular camera manufacturers. Automatic functions of this flashgun deliver outstanding results and creative possibilities.
2. Macro Flash Adapter in many different sizes

ɔ55mm, ɔ58mm Macro Flash Ring Adapters are provided with this flash unit, ɔ52mm, ɔ62mm, ɔ72mm and ɔ77mm ring adapters can be purchased separately. These Macro Ring Flash Adapters in many different sizes make it possible to attach this flashgun to a wide variety of lenses.
3. Wireless Flash Function

For giving three dimensional feeling to the subject in the picture or lighting of background, side-light, top-light, etc., it is possible to use wireless flash EF-500 DG SUPER separated from the camera.
4. Flash tubes can be switched on or off for creative flash control

Flash tubes can fire together or independently for a wide range of lighting variations. When shadowless mode is used subjects can be photographed in fine detail, this can be done by firing both flashtubes. Using only one flashtube creates shadow, which can give a three-dimensional feeling to the subject. 
5. Equipped with Exposure Compensation Function

Exposure compensation function delivers outstanding creative possibilities for precisely reflecting the photographer’s intention. The subject’s delicate textures, its reflectivity as well as background, and light balance, etc. can be adjusted finely.
6. High Speed Synchro (FP) Flash

High Speed Sync allows using a shutter speed faster than the shutter’s normal synchronized speed.
7. Modeling Flash Function

The modeling flash allows for checking shadows and light balance on the subject prior to shooting.

Guide Number 14 ISO 100/m (when the flash is fired at full power) Power Level 1/1 1/2 1/4 1/8 1/16 1/32 1/64
1tube-2tubes 14 10 7 5 3.5 2.5 1.8

Power Source AA Alkaline Battery or AA NiCd Battery or AA Ni-Mh Battery x 4pcs
Angle of Coverage Vertical / Horizontal 80 degrees
Weight 430g (without batteries)
Dimensions (Controller) 76.7mmX136.2mmX82.4mm (3.0x5.4x3.2in.)
Dimensions (Flash Unit) 126.6mmX128.8mmX30.5mm (5.0x5.1x1.2in.)
Compatible Cameras SA-STTL (SIGMA), EO-ETTL (CANON), MA-ADI (MINOLTA), NA-iTTL (NIKON), PA-PTTL (PENTAX)

http://www.sigma-photo.co.jp/english/flash/flash_140dg.htm