Originally Posted by Terry B
Very good Rob
Interesting that there is no evidence of the UV band in your images. I assume that the camera lens has a UV filter from the coating.
Hi Terry - yes, I'd imagine that the filter would cut it. However I've been through the three subs I've got and there does seem to be a faint line there, which I've duly processed out with levels in the posted spectrum to hide noise!
Of the three subs, the first is by far the best, the other two being badly affected by cloud. So I just processed that sub, this time leaving noise & a stray faint star spectrum in. I've got the probable CN line arrowed in both the image and the bar spectrum. Judging by your spectrum, the Bayer filter on the camera (is it a Bayer filter?) has had a major impact on the CN line or it would be a bright dot in the image. Thanks for pointing this out!
I'm currently camera-less (waiting on a new DSLR) but I'll try to replicate this when it arrives, hopefully in better skies.