EXIF info in Finder -yes!
You can see some EXIF info right in OS X's Finder. Select the file you want the info on, and click File>Get Info from the Finder's menu. Expand the "More Info" triangle in the info window that opens to see the dimensions, device make and model, colorspace, profile, focal length, alpha channel, red eye, f-number and exposure time - those last two bits were what you were looking for, right?
The shortcut for displaying the info is command-I, but if you press option-command-I, you get an interactive Info window, i.e., an Inspector, the window stays open and changes to reflect the content of each file you select.
Unfortunately, it doesn't seem that Spotlight indexes this info, so it can't be searched in the Finder, but it is visible! Vista... shudder... does something better than OS X? NOT!!!
dmz