3. In “Exposures & Guiding”:
* Move GUIDE MIRROR IN BEAM by clicking on that box.
* Adjust the guider exposure time in the grey box, and click Click "Expose" and select exposure time from drop-down menu to start images.
* Under “Image Options” select the preferred LUT and SCALE.
* Hint for good scaling in the display: keep the bottom slider all the way to the left and move the top slider towards the left until the stars appear. Then adjust the vertical slider.
* Open the guide star software (the icon of a star with a long tail).
* Enter coordinates of the field and click "GET IMAGE". A window should appear with a 10x10 arcmin DSS map.
* Click on a bright star '''outside''' of the green circle in the DSS image. **NOTE: this chart is centered on the coordinatedcoordinates. If you have adjusted the position of the target to be away from the center of the acquisition frame, there will be the same offset in whatever guide star is selected.
* Under "XY Slides Control," click "GoTo GS". The star should appear in the acquisition image. If not, try a different star.
* Under “Pointer" click "Guide Star" , then click on the chosen guide star in the acquisition camera FOV. This will put a blue box around the star and begin guiding.
** NOTE: if the star is near a hot pixel, that could cause trouble with guiding. Click "Move XY" and click on the star to : this will center it (this just moves moving the XY stages, and will not effect effecting the science target).
* To stop or restart guiding (e.g. after brief intervals of cloud), press GUIDE.
* To change exposure times, press STOP, update the select exposure time in from the grey box, and press drop down menu under Expose.
==Instrument Focus Settings==