To accomplish the image shown below we (Ted Williams, SALT engineer Peter Menzies and SALT Astronomer Nic Loaring) have taken hundreds of calibration images, conducted numerous mechanical shimming exercises and generally pulled our hair out over the past two years at the telescope!
The image below shows a calibration ring of the Ne 653.2 nm emission line taken in the 653 nm narrow band filter with both the low resolution ("small gap") and medium resolution ("medium gap") etalons inserted. This combination of etalons will be used for Fabry-Perot observations at medium resolutions.
|RSS Fabry-Perot image showing a Ne 6532 calibration ring taken in dual etalon mode.|
|Fabry-Perot mode RSS instrument team specialist Ted Williams - you'd never guess that he was pretty chuffed! (SALT Astronomer Encarni Romero-Colmenero is in the background).|