Quote:
Originally Posted by Slawomir
I have noticed a significant improvement in SNR after moving from Brisbane’s inner city to a small town. For example - good flats were essential even for 10-minute 3nm Ha subs on a moonless night, while in Prossy, as long as the bright one is not up, I can easily get away without flats when shooting 20-min 3nm HA subs, unless I’m chasing the faintest bits and stretching like mad. Background noise is much less here in Prossy in subs taken through 3nm filters, with the same scope and camera. Good narrowband filters like Astrodons help big time, but from my experience are not immune to strong light pollution. I strongly recommend a dark, or at least a darkish site  |
LP spectral emissions are almost non-existent in the H-alpha spectral region. In fact depending on where in the spectrum you want to image, (e.g. deep IR) daylight is fine...so long as you have good transparency and low humidity. The major attenuation effect I find is simply sky transparency...which, sure, away from urban aerosols/air pollution is likely to be better.
I know you Banana benders also have a penchant for burning coal (who said Adani ? )
.... but can't say my local aerosol exposure is the same.
The air quality in southern Sydney and sky transparency is surprisingly very good, with significant green space in the Royal National Park to the east, Heathcote and Holsworthy reserves to the south and south west.
But as for my Northern sky......
