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Excellent Marc! You can really see the differences between the emission lines. M42 really shows that Ha brings the finer detail in structures, where as NIR can't be mistaken for a much larger bandpass window where it is capturing the faint larger structures. I like the comparison you've displayed. I could see this being used as a luminance perhaps layered with Ha data. You've needed to put in considerable exposure time to get these solid results. It looks worth the effort. Is your set up all reflecting? i.e. there is no glass in the imaging train. Any refractive elements may introduce an IR cut off so results are less than optimal. This also applies to ccd cover slips where in most cases it is removed to improve QE.
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