Sunpak auto 4205G Thyristor
The Sunpak auto 4205G Thyristor (also known as auto 544 in the US) is a classic professional “hammerhead” flash.
Some example studio shots to get an idea of the light output using several modifiers are below. The setup is:
- Distance to wall: 200 cm
- Wall width: 300 cm
- Wall height: 240 cm and flash set at 120 cm height
- Wallpaper: 2 colors is 70 cm width
- Flash power setting: 1/2
- Camera settings: 100 ISO, 1/125 sec, 16mm (APS-C), aperture set every shot after measuring using a flash meter
Light distribution and intensity
![4205 bare F/13](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2938.jpg)
Bare flash, F/13 lightbeam 35mm = 60 deg
![4205 28mm diffuser F/9](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2939.jpg)
Using a 28mm diffuser = 74deg. F/9
![4205 20mm diffuser F/6.3](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2940.jpg)
Using a 20mm difuser = 90 deg. F/6.3
![4205 with 1/4](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2941.jpg)
Using a 1/4″ grid. F/13
![4205 with 1/8](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2942.jpg)
Using a 1/8″ grid. F/13
![4205 with TL-3 converter @ T1 = 85mm](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_5283.jpg)
Using a TL-3 converter @ T1 = 85mm F/16
![4205 with TL-3 converter @ T2 = 135mm](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_5296.jpg)
Using a TL-3 converter @ T2 = 135mm F/16
![4205 with foldable reflector F/5.6](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2944.jpg)
Using a foldable reflector. F/5.6
![4205 with shoot-through umbrella F/6.3](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2946.jpg)
Shooting through a Westcott umbrella. F/6.3
![4205 with reflecting umbrella F/5.0](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2949.jpg)
Shooting in a reflecting Westcott umbrella. F/5.0
![4205 in 60x60cm single diffuser softbox F/7.1](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2952.jpg)
In a 60x60cm softbox with single diffuser. F/7.1
![4205 bouncing off the ceiling F/5.0](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2961.jpg)
Bouncing off the ceiling (causing some color shifting). F/5.0
Hotspots with several modifiers
![4205 bare in refl. umbrella](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2955.jpg)
Without modifiers in reflecting umbrella
![4205 with 28mm diffuser in reflecting umbrella](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2956.jpg)
With 28mm difuser in reflecting umbrella
![4205 bare through umbrella](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2957.jpg)
Without modifier through umbrella
![4205 with 28mm diffuser through umbrella](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2958.jpg)
With 28mm diffuser through umbrella
![4205 bare in 60x60cm softbox](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2954.jpg)
Without modifier in 60x60cm single diffuser softbox
![4205 with foldable reflector](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2959.jpg)
Using a foldable reflector
Casting shadows
![4205 flash with reflecting umbrella](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2947.jpg)
Shadow using the flash in a reflecting umbrella: very soft light
![4205 and 60x60cm softbox](http://aarslog.persijn.net//uploads/2010/_Sunpak_4205G_2951.jpg)
Using a 60x60cm softbox the light is much harder