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I use a separate camera in Maya usually to tune materials (until we get region render - hint hint) and have to manually set the focus distance whenever I move the persp1 camera or my things will be out of focus. Maxwell inputs aren't available as driven key items so I'm wondering if there is a way to make this manual focus value update based on a locator's distance from the persp1 camera.

I just tried a Connection Editor link between a distance tool and the Maxwell camera settings but it didn't work:

Maxwell doesn't use the native "focusDistance" attribute, it has its own custom attribute called "mxFocusDistance". Try something like this instead:

that did it - thanks so much.