Spectroscopy Part 2 - Spectrum of Vega

Continued from Part 1

I managed to acquire a spectrum of Vega so that I could measure the Angstroms per pixel  for the 135mm lens and grating combination. This is a type A star that I need as explained yesterday.

But first of all here is the Capella spectrum from Part 1 shown as an uncalibrated profile.

The Canon 40D has 3,888 x 2,592 pixels. The longer axis of the CMOS chip corresponds to the x axis with the horizontal spectra. What I need to be able to do is to calibrate the x axis so that it displays in Angstroms i.e. wavelength units rather than pixels.

Here is the uncalibrated profile for the star Epsilon Aurigae shown in the same manner as above

Back to Vega now - here is a 15 second image of Vega

 Continued in Part 3