Sunpak 120J

Check availablity: eBay.

There are two versions, suffixed "Auto" and "TTL" (the latter is legacy OTF TTL that is not compatible with digital caneras).

Professional parabolic reflector flash with 2 zoom positions (wide = 28 mm + normal = 43 mm), the reflector can be removed for diffuse lighting (equals 115ws).

Alternative power sources include Sunpak Powerpak for 510V (1s recycle), NC-510 (3s recycle), TR-Pak IIa (2s recycle) and AC adapter AD-26 (15s recycle for 120V).


Generic flash.
Head: 28, 43 mm coverage, manual zoom.
Swivel & tilt: -90° to +90° swivel, 0° to +90° tilt.
Exposure modes: Auto, OTF.
Manual settings: 1/1 to 1/16 a 1EV steps (5 steps).
No built-in wireless modes.
Features: Ext. power.
Trigger voltage: 12 volt.
Batteries: 4xAA.
Flash duration: 1/600 sec. @ 1/1 (full output).
Field upgradable: No.
Dimensions: 92 x 145 x 75 mm, 420 g.

Zoom head setting:f=35mmf=50mmf=max
Guidenumber (ISO 100, meter):364545
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: 1963
HQ: Saitama, Japan
Web: Global, man

Sunpak's main business is the planning, development, production and sale of aftermarket electronic flash units. The company also markets general underwater imaging equipment.

Some Sunpak flash units have an auto power save function that may put the unit to sleep after about some time of inactivity (from 5 to 15 minutes, depending on model). When using your flash as a wireless slave, the power save mode may stop the flash from responding after a while. If the manual does not tell you how to disable automatic power save, it may work to hold down the mode and select (SEL) buttons as you power it on, or to hold down the zoom button as you power it on.

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