The Autofocus-Box is designed to illuminate a test chart at different light levels.
In combination with the LED-Panel the AF-Box can be used for low light / bright light shutter delay measurements of digital cameras. By using the two rotary conrol units it is possible to switch from one light level to the other immediately. So two different light levels can be preset by just using a switch without remeasuring the illumination level again.

Illumination level	20 - 3000 Lux
Size of used test chart	83 x 83 cm
Provided test charts	TE261 or other
Lamps	4 x 2 18 W D50 can be switched on/off separately
Setting of light level	Two rotary control units