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5nm vs 3nm Ha Filters- the NII question
Hi All, yay I just took delivery of a spanking new ASI1600 mono cooled cam!
Will be ordering a 7 by 36mm FW from Starlight Xpress.
Along with 3nm Astrodon OIII and SII filters.
I have done plenty of web research including this forum. Am happy with the 3nm Ha option with my Tak F3.3 setup and relatively darkish skies in the mornington peninsula.
But I am curious at the extent of NII signal that will be missing from such an Ha filter. I can't find any convincing discussions or images that prevent me from picking the 3nm filter.
I'm more into the 'big'n pretty' nebs, doubt I'll be taking many pics of planetary nebs. Maybe helix at the most.
What ya reckon? Thanks in anticipation
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