I have an ALPY600 spectroscope with guiding module, since a two weeks installed on my 0.4-m newton telescope. After some experimentation, I decided to purchased the calibration unit as well and installed a few days back. I took a calibration lamp spectrum and a flat and I try to apply it in the ISIS software
I come here on a problem because the calibration fails. evenso after adjusting the pixel size remains the deviation> 10 ang. I see mostly situated in the blue area (Ar). The pixel size of the SBIG ST10XME is 6.8 microns. Here the results from ISIS calibration of the calibrationlamp spectrum.
![Sad :(](./images/smilies/icon_e_sad.gif)
Fitting deviation (wavelength)
point #1 x = 676.291 lambda = 3934.747 dlambda = -45.697
point #2 x = 677.202 lambda = 3938.363 dlambda = 31.717
point #3 x = 714.093 lambda = 4083.896 dlambda = 17.854
point #4 x = 779.267 lambda = 4337.145 dlambda = 3.335
point #5 x = 920.475 lambda = 4872.490 dlambda = -11.150
point #6 x = 1187.031 lambda = 5851.034 dlambda = 1.456
point #7 x = 1162.755 lambda = 5763.166 dlambda = 1.254
point #8 x = 1212.562 lambda = 5943.202 dlambda = 1.628
point #9 x = 1302.365 lambda = 6265.392 dlambda = 1.098
point #10 x = 1370.083 lambda = 6506.113 dlambda = 0.417
point #11 x = 1554.571 lambda = 7148.943 dlambda = -1.903
point #12 x = 1624.401 lambda = 7385.452 dlambda = -1.502
point #13 x = 1726.673 lambda = 7722.268 dlambda = 1.492
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RMS : 21.107494 (in angstroms)
I followed the tutorial C.Buil for ISIS and ALPY600.
as attachment, check the spectrum of the calibration lamp (50% resized) Ar_ne_calibratie.jpg
below the flat image alpy ST10XME with 600 (50% resized)
Anyone know how I can get the calibration right?
![Question :?:](./images/smilies/icon_question.gif)
thanking in advance
Kind regards
Erik.