Aperture: Editing through the loupe tool
I could swear I have seen videos where aperture users are using the loupe tool to zoom in on problem areas, then use a brush tool "under" the loupe, so they can see the brush effects magnified. Particularly handy when dodging/burning so you can see edges & transitions in detail.
But when I try to do this.... soon as I move the brush across the loupe, it turns into a cursor to move the loupe rather than apply an adjustment.
Am I missing a setting somewhere or is the loupe really limited to viewing only? Is there another way to "zoom in" to show detail when applying adjustments?