Sigma EF-430 ST

Check availablity: eBay.

This flash was designed for dedicated OTF TTL use. It is not compatible with the type pre-flash TTL found on DSLRs. Manual mode may work on a DSLR, but in some cases, you may have to isolate or remove the “extra” TTL control pins from the hot-foot to stop the camera from being confused by the legacy OTF TTL protocol.

Comes with an 18 mm wide panel.


Legacy flash (may not work well with a DSLR).
Head: 18, 28-80mm coverage, power zoom (tracks lens).
Swivel & tilt: no swivel, 0° to +90° tilt.
Exposure modes: Varipower, OTF.
Manual settings: 1/1 to 1/16 in EV 1 steps. (5 steps).
No built-in wireless modes.
Features: LCD.
Trigger voltage: 4.8 volt.
Batteries: 4xAA.
Flash duration: 1/100 sec. @ 1/1 (full output).
Field upgradable: No.
Dimensions: 116 x 76 x 107 mm, 280 g.

Zoom head setting:f=35mmf=50mmf=max
Guidenumber (ISO 100, meter):323643
GNs taken from manufacturer's specifications.

Discontinued: Yes.

For a detailed explanation of the above specifications, see the guide.


No literature yet.

Brand profile

Key info

Established: 1961
HQ: Kanagawa, Japan
Web: Global, EU, US, man
Map location

Sigma is a family owned manufacturer of photographic equipment founded in 1961 in Japan. The company's main business is to manufacture third party lenses. However they also produce third party flash units and, since 2002, their own line of DSLR and compact cameras. Sigma's digital cameras use a special sensor, developed by Foveon, that records full color information for every pixel. In late 2008 Sigma acquired Foveon.

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