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If you need to control the focus point independently of the aim point, you can check the "Manual Focus Distance" box in the Maxwell attributes group and adjust the "Focus Distance" attribute. The focus plane will still be perpendicular to the camera aim vector, but it will be placed at the specified distance from the camera position.
If you wish to move the focus to a certain object without altering the camera position, you can select both the camera and the object and click the "Focus to selection" button on the Maxwell shelf (
). If Manual Focus Distance is off on that camera, this will move the aim locator to the pivot of the selected object. If Manual Focus Distance is on, it will leave the aim locator in place and alter the Focus Distance attribute instead.
Exposure
The exposure of the rendered image is influenced by the shutter time, f/stop number and film ISO rating. The shutter time and f/stop also influence motion blur (if enabled) and depth of field, respectively. The ISO value acts simply as an intensity multiplier and doesn't alter any other aspects of the output (in a real DSLR, increasing the ISO also increases the electronic noise of the sensor, but Maxwell simulates a "perfect" sensor which does not have this unwanted behavior).
Keying Maxwell Attributes