Cine EI: What is EI?
ISO is the camera’s sensitivity to light. The camera has two ISO (Base
Sensitivity) settings in Cine EI: Base Low (800 ISO) and Base High (12800 ISO).
You cannot change the ISO (or add GAIN). The ISO will always be one of
these two settings.
Iris, ND filters, and the shutter speed change the actual exposure, the
amount of light getting to the camera’s sensor. I adjust iris and ND values but
always keep the shutter at twice the frame rate unless I want a special effect.
EI stands for exposure index. It is an offset that is applied to the exposure.
When you are changing the EI preset on the camera, you are changing the
brightness of the LUT that you applied.
You can choose a lower EI preset value than the Base ISO to slightly
overexpose the image. This is useful for reducing image noise at the Base
High Sensitivity setting (12800 ISO).
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