Recently I decided to open up my wallet widely and go Narrowband...
And before my set up comes, I decided to check how to process NB images.
The last half a year was mostly cloudy so I started playing around with Hubble TelescopeRaw Images
If someone will decide to kill some cloudy evenings in the same manner,
Hubble Telescope raw images are freely available on Hubble Legacy Archive https://hla.stsci.edu
And please also share your results on this forum.