Filming with HMI Light

When lighting scenes with HMI/CID-discharge lamps, the pulsing light intensity is dependent on the supply frequency. To achieve constant exposure, the camera’s frame rate, the supply frequency of the lighting and the angle of the mirror shutter must all relate to each other. As the camera frame rate and the supply frequency of the lighting are normally given, compensation must be carried out through the angle of the mirror shutter.

The following table indicates the mirror shutter angle that needs to be set:

Supply frequency

50 Hz

60 Hz

 

 

 

 

Frame rate

25 fps

24 fps

24 fps

Shutter angle

180°

172.8°

144°

 

 

 

 

Camera Body

39