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In the render globals, under the DoF settings, is the Aperture Size parameter used to calculate the diameter of the aperture or is it the radius?
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Aperture (in the Render Globals roll-out) is the size of the virtual camera aperture in world units, meaning that it has no real-world counterpart. Small aperture sizes reduce the DOF effect, larger sizes produce more blur.
Instead of using Render Globals roll-out, you could enable DOF in the V-Ray Physical Camera parameters and use F-number parameter to control the aperture size of the virtual camera. F-number represents the ratio of the diameter of the lens aperture to the length of the lens. Lowering the f-number value increases the aperture size therefore the Depth of Filed, in reverse, increasing the f-number will reduce the DOF effect.
Also, keep in mind that when the DOF in V-Ray Physical camera is enabled it will override the Depth of Field in the Render Settings.
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