Well.
My new DGM NPB filter arrived yesterday and so far I'm delighted.
It arrived very nicely packaged and included all the relevant paperwork
I had a very brief opportunity to test it last night around 7pm on 2 obvious candidates: M8 and M17.
Wow

Very impressive. I've not looked through many other UHC-style filters but I can say this compares very favourably. IMO, it easily outpunches the Baader equivalent. I'd also be inclined to say it's not very far behind (if at all) the Astronomik filter I've looked through. Although I don't remember which specific "flavour" of UHC that was, other than it was a UHC
The lagoon was simply stunning. It looked almost as bright through my 9.25 as M42 without a filter
The major dark channels, the grey nebulosity, the bright central core and curving "sandbar" to the east were impressively clear.
I was so excited I quickly slewed the scope over to the Swan. Ditto. Nebulosity jumping out all over the place on an inky black background!
I'd never seen the looping black channels so clearly on the body of the Swan and the neck and head were very easily seen.
And then of course? Well, it's a familiar story: inexplicably for a Tuesday night, neighbours on both sides turned
all the backyard lights on
On one side they are a household of three very full-on smokers and all decided to step outside to "light up" at the same time, just as I was attempting to hunt down The Triffid.
I kid you not when I say it was like being at a Benson and Hedges convention. The smoke issuing from that backyard resembled something very closely akin to the view of The Great Fire of London
I'm not a smoker. That was me done. Inside by 7.15pm... stinking like I'd just spent 4 hours down the pub without a rosy glow to show for it!
But ........
as far as the NPB goes? It looks very promising