Science - ericsimages

The Top spectrum is the full spectrum from a full spectrum Canon 40D, using a homemade transmission holographic grating.
The bottom spectrum uses the same camera and grating, but includes the Astronomik Pro-planet 742 IR filter (hopefully aligned correctly). It may appear that the spectrum (with the filter) extends further in the IR, but it's just a difference in exposures of the two spectra.

These are raw, unprocessed spectra.