I have been slowly getting better at capturing data and producing spectra however, the quality is not as good as I would like and does not come close to what others are posting with similar equipment. Specifically, my absorptions are often pretty shallow and sometimes (such as on some A and B-types, they are completely absent.
I am using a C8 at f10 with the SA-100 and a 178MM.
My typical spacing gives a dispersion of around 3.65 A/pix and an FWHM of 12.3.
I have done a few experiments with a greater distance ( and a dispersion closer to 2.0) but I am not sure that is helping and, from what I have read, that may be pushing things beyond what is useful.
I think I have my focus and exposure nailed pretty well so I am wondering what else I can do. And I am beginning to be able to stack multiple exposures to reduce noise (but that also seems to reduce the depth of my absorptions...).
Adding a 0.63 FR would reduce my FWHM. Would that be useful? Would an Alpy 600 running in slitless mode (I don't want to add the complexity and cost of guiding in slit mode right now) produce better results or do I simply need to practice and improve my technique some more?
Thanks for your advice.