I find it quite remarkable how dim you can go with this snapshooting method and still obtain semi-decent spectra, even at a light-polluted site. My home has a Visual Limiting Magnitude varying around 3.5, yet one can easily obtain reasonable, if noisy, spectra on stars of that Magnitude in 30-second exposures. Nevertheless, there is one unpleasant side effect in going deeper. The fainter the star you are chasing, the more stars there are that are as bright or even brighter; congestion, especially in the Milky Way! That's a major reason why, to go much deeper you need the magnified FoV of a telescope (to spread out the field of stars and of course to increase the photon gathering) and even a slit, especially for extended objects. Tracking only becomes necessary when you want to push your equipment to its limits. With a C14 one should easily be able to access several Magnitudes deeper, but it won't be snapshooting any more :-( OK, rather than bore you with an endless number of spectra, I thought I'd check out if I can snapshoot a nebula, M42. The above demonstrates some of the congestion issues. Top image shows the "Sword" of Orion nicely spread out in a North-South manner, but the star trails are East-West, smearing out the spectral lines. Rotating the camera+lens 90 degrees makes the star trails nicely orthogonal to the spectra, as desired, but the nebula spectrum now gets contaminated by those bright stars all around :-( OK, one answer would be to rotate 45 degrees, but then we have to "perspective correct" or "warp" the 45 degree inclined trails and spectral lines to keep them narrow yet orthogonal to the spread of the spectrum. Not a big deal and I have done it for the bottom example. But first note that the Orion Nebula has within itself a couple of Magnitude 5 stars that are unavoidable, clearly seen on the zero-order diffraction images above and including the stars of the Trapezium. So we would still expect some kind of continuum background to the nebula spectral lines. The Orion Nebula is also an "extended object", even at this image scale, and so the spectral "lines" will be rather fat, except when one includes a slit somewhere.