Use the functions Tilt and Slant of ISIS (1. Image window)
Try to get value 0° for the two adjustments
Slant adjustment: move gentlty the slit miror on its support. Very difficult because the miror moves when tightening the screws.
Tilt is easier by rotating the science camera
Process by steps : tilt, slant, tilt, slant ... until the better result (Here, the slant could be improved a little bit more - tilt = almost pefect)
- Slant.PNG (278.47 KiB) Viewed 1789 times
- Tilt.PNG (138.36 KiB) Viewed 1789 times