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Ha 7nm vs 5nm
Managed to get a single sub last night before the clouds rolled in.
Anyway this is a comparison between a couple of 30 min Ha subs of the Helix.
The one on the left is with my new Astrodon 5nm filter and it was taken when the Helix was only about 45-50 degrees high, also the last couple of minutes would have had cloud covering.
The one on the right was taken with my Baader 7nm filter when the Helix was near zenith.
Both have just an auto stretch applied.
With the extreme light pollution here the difference is quite pronounced!
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