Here is brief filter report from my recent NV observing night.
Sky: Bortle 5, 1/4 Moon
Set up: See picture
2x MOD3C white phosphor, filmless with
2x 75mm f1.8 Kowa lens (effective aperture 41mm each) modified for 2" filters. FOV=13 deg
Wilcox military helmet with dual MOD3 mount and 5lb counter weight (those Kowas are heavy)
Ha Filters: Baader 3.5nm (2x), 7nm (2x), Chroma 5nm (2x)
Before I began my observation my guess was that since I am observing from light polluted place the 3.5nm filter will perform best.
So, by panning around the sky (moving my head) I've looked at and I could see these nebulas:
Cygnus - North American, Pelican, Gamma Cygni, IC1318, and Veil
around Sagittarius (half way between Saturn and Jupiter) - Eagle, Swan, Lagoon and Prawn
To my surprise the 3.5nm Baader gave me the "weakest" view, or a view with least contrast. Next was 7nm Baader and the best view (= best contrast) was with the 5nm Chroma. However it could be that 5nm is the best filter for NV, rather than Chroma is higher quality filter than Baader. That I do not know. What I do know that at Bortle 5 sky I am using Chroma 5nm.
I do not (yet) take pictures of what I see, however the smart phone pictures of the above mentioned nebulas using NV (and which are posted elsewhere on CN) pretty much represent what I've observed.
I could not see any of the weaker Sharpless catalogue nebulas (in Cygnus and Sagittarius). I am curious whether I need darker sky or I need to use bigger telescope to see them. I plan to do just this in the future, so stay tuned.