These slits, that can be used for Lhires III or LISA, contain two widths : one thin part to get the full resolution of your spectrum, and one wide for getting the whole light coming from the star. When combining the observations of a given star with bith parts of the slit, you get not only the spectrum of the star, but also its photometry.

Four available positions:

  • 23/200µm
  • 27/250µm
  • 31/300µm
  • 35/350µm