My version of instructions on how to do this – incorporates Christian Buil’s guidance and my own screenshots. PDF Version: http://astronomy.me.uk/wp-content/uploads/2024/07/Calibrating-wavelength-in-VSPEC-Visual-Spec-Software-280724.pdf Word Version: http://astronomy.me.uk/wp-content/uploads/2024/07/Calibrating-wavelength-in-VSPEC-Visual-Spec-Software-280724.docx Post navigation Convenient and helpful device to improve focus of camera tube on Sol’Ex spectrohelioscope Pack for attendees at Rosliston Astronomy Group Spectroscopy Processing Session Sept 2024