I had a great night last night. I recreated an IR curve using Vega and captured the spectrum for 6 stars. I was able to get a very close match for 5. But I had two problems:
1) I seem to have a ton of noise at the red-end of many of the spectra. I was capturing data in SharpCap and then transferring a single frame to RSpec. I think it is because I had the exposure was too low and consequently had to crank up the gain too much but it seems that the extra noise was much worse at the longer wavelengths. Is there an explanation for this? I think my spectra were better after I realized this and corrected it but not quite sure. Please see the image of Scheat.
2) While 5 out of 6 spectra were very close to the reference, my spectrum of DenebAlOkab was way off. It is supposed to be a K2 star but my spectrum is much closer to an A or F. I thought I must have simply captured the wrong star but it looked like I was aiming correctly???
For all, I captured with my Evolution 8 at f10 with a 178 mono camera and the SA-100. I used a spacer to get to 3.65 A/pix.
Thanks for any hints.