Tips to take pictures of ghost

Besides many ways to make a fake ghost picture by long exposures or Photoshop. Ghost can actually be taken by cameras.
Human eyes can only detect visible light with wavelength in the range between 380nm-780nm.
Ghosts register on a lower frequency that can be captured by a digital camera, not by human eye.
Digital cameras can pick up a range of light well beyond that of the human eye.
 Tips for Capturing Ghosts with Your Camera