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The pixel size is only used for the predefined modes. With the ALPY it sometimes needs adjusting slightly to get ISIS to lock onto the right lines. Perhaps the LISA is the same ? With file mode, have you tried altering the dispersion in the .lst file slightly to see if that allows ISIS to lock onto...

For ISIS the pixels size of 9.08µm is not correct because you need calcul it with : Pixel size = 3123/(Ha - Hb) Thanks for the suggestion Etienne Based on an earlier thread regarding the Alpy, I tried this method. Trialling this with unbinned images, I received a pixel size of 3.65 - well short of ...

David good to hear from another LISA user. You pose an interesting question. I have been operating the spectroscope on the basis that internal focus is steady and that I need only concentrate on focus via the telescope. I haven't seen much drift in resolution as a result of a fall in temperature. Th...

Here are some screenshots that may help showing what I am encountering: (I have the screenshots in reverse order - but you should be able to see the issue) The RMS flips from 0.98 to 15.5 for the inverse multiple times till the profile is generated. This is with the Predefined mode for the LISA - th...

Over the last few days, I have had the opportunity to play with the beta version of Demetra. It works well with my binned images - though I have yet to process any unbinned images. So my work around is - use Demetra for binned images and ISIS for unbinned images. Any assistance would be appreciated....

Hello I'm back to spectroscopy after a break of 7 years and working my way up the learning curve with ISIS. I have my rig at Coonabarabran NSW, Australia adjacent to the Siding Springs Observatory and operate it remotely. Its been a challenging exercise but the first results are proving very positiv...