Yes, the radial filter works from the center outward. But the graduated filter leaves everything about the starting point as it was, and then gradually applies the adjustment you need from that point to where the filter ends. There is no provision for creating a gradual filter beginning in the center.
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To create the equivalent of a Graduated filter with the effect starting at the center you can drag the radial filter endpoint to stretch it off-screen. Use the hand tool to push the radial filter off-screen and then drag the endpoint out further. You may need to do this a few times. You can also use two Graduated filters back to back, which gives you the ability to apply a centered Exposure correction and adjustments for Highlights and Shadows correction that are different on each side.
Thanks for the replies. I guess I will have to go with the Radial filter. This is probably for me most useful using the Invert Mask.