The Emperor Angelfish is a very common angelfish and I would suppose because they are so common they are pretty easy to get a picture of. They are found in most of the pacific and hawaii and the Red Sea and over to East Africa.
They are some of the bigger angelfish at 15 inches for adults with a blue stripe and black band over their eyes and a blue and yellow striped body with yellow tails.
Found normally in 6 to 60 meters of water more common in the 10 to 30 meter range on coral reefs. Juveniles have a striking blue and white stripe patten and much harder to get pictures of.