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Mode – Chooses between several modes of applying the exposure control.  

From VRay camera – Exposure settings are taken from a VRayPhysicalCamera specified in the Camera node. 
From EV parameter – Exposure settings are based on the Exposure value (EV) parameter. 
Photographic – Exposure is controlled through the Shutter speed, f-number, and ISO parameters.

Camera node – Specifies the VRayPhysicalCamera node from which the exposure settings will be taken.

Exposure value (EV) – Controls the exposure with a single parameter. Increasing it makes the image darker and decreasing it makes it brighter.

Shutter speed – Shutter speed, in inverse seconds, for the still photographic camera. For example, shutter speed of 1/30 s corresponds to a value of 30 for this parameter. 

f-number – Determines the width of the camera aperture and the exposure. 

ISO – Determines the film power (i.e. sensitivity). Smaller values make the image darker, while larger values make it brighter. 

White balance preset – Modifies the image output in the same way that a real-world camera performs a white balance. Objects in the scene that have the specified color appear white in the image. Note that only the color hue is taken into consideration; the brightness of the color is ignored. There are several presets that can be used, most notably the Daylight preset for exterior scenes. 

White balance – Specifies a custom color for the white balance. 

Temperature  – When the White balance preset is Temperature, this parameter controls the white balance color.