FSX field of view

Anyone know precisely what the FSX field of view is at zoom 1.0? It looks like a zoom of ~0.71 in FSX equates to the default zoom of 1.0 in FS9, but I'd like to get a more precise value than this. Just as in FS9, my (and the default) FSX panel.cfg's, at full view window, STILL force a size X and size Y of 8191 and 6143, which I always took to mean .8191 by .6143 radians of scenery. Not so, now, with FSX. Some other setting obviously trumps these panel.cfg lines... or else (very possibly) they don't mean what I thought they did. I do not yet have the SDK, so any help would be appreciated. Thanks!(By the way... I like the change. Though it's more "tunnel vision-esque" in FSX, there is a better feeling of height and depth... though obviously to the detriment of peripheral vision. It'd be neat to hear other opinions.)