iPhoto 9.2.2:
select your photo either in its event folder (so it has a yellow border around it) or full screen, on the top bar navigate to view and then info - this will show all the shooting date (ISO, aperture, shutter speed,focal length, camera used, etc) you need.
Photoshop Elements:
select your photo, right click and ask to show properties - same info will be displayed in a pop up window