Sunpak B3600D

Check availablity: eBay.

Rebranded version of Sunpak Auto 433D.

Very nice auto thyristor and varipower flash with tilt and swivel head. There also exists optional accessories including zoom and colour filters, and an external power pack.

Three auto thyristor ranges (f/2, f/4, f/8 @ ISO 100)

Sold as Sunpak auto 433D in the USA and Canada and Sunpak B3600D in all other countries.


Generic flash.
Head: Fixed 35mm coverage.
Swivel & tilt: -180° to +150° swivel, 0° to +90° tilt.
Exposure modes: Auto, Varipower.
Manual settings: 1/1 to 1/16 a 1EV steps (5 steps).
No built-in wireless modes.
Features: Ext. power.
Trigger voltage: 5.2-6 volt.
Batteries: 4xAA.
Field upgradable: No.
Weight: 310 g.
Guide number (ISO 100, meter): 36.

Discontinued: Yes.

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



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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