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Message: <blockquote data-quote="WayneF" data-source="post: 221688" data-attributes="member: 12496">The illumination patterns (Standard, Center, Even) are themselves zoom positions.  Center zooms in a bit to concentrate more light in the center (at expense of covering the corners).  Even zooms out a bit to make sure the corners are covered evenly.The Dome does necessarily change to a preset wide value (a lot of this is about making the reported guide number be correct).  But then illumination patterns do adjust that value slightly.  Using your numbers, 8mm is zoomed in a bit to concentrate light in the center.  11mm zooms out a bit to insure corners are even.</blockquote>