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Aperture F-number vs Shutter Speed vs ISO
Cheat Sheet
The main options that control the brightness of a V-Ray Physical camera are Aperture F-number, Shutter Speed and ISO. They affect each other and you need to balance them according to your scene.
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To enable the DoF effect you need to turn on the turn on the Depth of field option DoF & Motion blur rollout of the physical camera. The effect is most strongly seen when the camera is close to an object, for example when doing a macro photo. For a strong DoF effect, the camera aperture must be open wide (i.e. small F-Number value). That may lead to a very burnt and bright image, so to preserve the same illuminosity over the whole image, the shutter speed must be shortened. And at last but not least the Focus distance determines which part of the scene will be actually on focus. To get the focus near, you would need a small value and reverse - higher value for far focus.
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To enable the motion blur effect, you need to enable the the Motion blur option in the DoF & Motion blur rollout of the physical camera. The amount of motion blur is determined by the speed of the moving object itself as well as the Shutter speed setting of the camera. Long shutter speeds will produce more motion blur, as the movement of the object is tracked over a longer time. In reverse, short shutter speeds will produce less motion blur. Keep in mind that to preserve the same brightness over the whole image, the F-Number value has to be corrected as well.
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