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V-Ray for Unreal works with standard Unreal cameras and Viewports. However, the standard cameras do not provide exposure control. To use exposure control and other real-world camera settings, it is recommended to use the VRayPhysicalCamera Blueprint Actor.

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The exposure and color corrections do not work as a global PostProcess volume and are individual per camera. To see the changes you make to the VRayPhysicalCamera's settings in the viewport you have to look through the camera itself.

 

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Filmback Settings

Sensor Width – Specifies the horizontal size of the film gate in millimeters.

Sensor Height – Specifies the vertical size of the film gate in millimeters.

Focus Settings

Focus Method – Specifies if Depth of Field (DoF) is applied to the camera. None means no DoF is applied. When Manual is selected, the DoF is controlled by the Manual Focus Distance and F-number parameters.

Manual Focus Distance – Specifies the distance at which objects are in focus.

Current Focal Length – Specifies the equivalent focal length of the camera lens in millimeters.

 

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The DoF feature is unsupported and when setting the Focus Method to Manual will not blur objects that are not in focus. However Manual Focus Distance is used to calculate the exposure when Enable Exposure is On and 3ds Max Compatible is Off in VRay Physical Camera Settings category.

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