Betelgeuse And Sirius

First spectra obtained using my homemade diffraction grating on my 127mm Meade refractor. Two mov. clips were obtained by hand holding a compact digital camera afocal style behind the eyepiece. I then converted the clips to AVis, stacked them using AutoStakkert and then played about with the results in APS. I chose the two stars because they are so very different and bright. More by luck than judgement the spectra look remarkably different, so I must be doing something right. I will try using my DSLR and QHY5v to obtain better results. Have read a bit about calibration and somewhat daunted, will give it some more thought. I use some of the functions of the freeware IRIS and have noticed some buttons relating to spectra guess I could always push them and see what happens!