You can position a lens flare according to exact coordinates. Before using the Lens Flare filter, place your cursor at the spot in the image window where you want the center of your flare. Note the X,Y coordinates in the Info Palette. Then when you select the Lens Flare filter, you can Alt+click (Windows) /Option+click (Mac) in the preview area to invoke the Precise Flare Center dialog where you can enter the coordinates noted earlier.
Related Resources:
Photoshop Filter Techniques
Compatibility: Photoshop (any version), Photoshop Elements
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