Re: the Eagle Nebula dubbed the Pillars of Creation
"CCD/CMOS sensors are only sensitive to photons energy, not their wavelength."
Sorry to be pedantic but a photons energy IS directly related to its wavelength, in fact "photon energy changes in inverse relation to wavelength" (ref: https://en.wikipedia.org/wiki/Photon_energy). I think you mean intensity i.e number of photons. However, have an up vote for the point you make.