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Originally Posted by ausastronomer
Houghy,
I would get the DGM Optics NPB filter.
As I said Phil Harrington rates it as the best Narrowband/UHC type filter he has ever used. I have a copy of a review Phil did on 25 different filters and the DGM NPB filter came out very very favourably. Unfortunately I can't be much more specific than that because the article has not gone to print and will do so in a future issue of an American Astronomy Magazine. The DGM NPB is very cheap and very good. Failing that if you want a top class excellent filter I would get the Astronomiks OIII from Bintel followed by the Astronomiks UHC from Bintel. If you are budget conscious I would get the Orion Ultrablock from Joe O'neil in Canada
CS-John B
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Houghy
We purchased a DGM NPB 2" & 1.25" Filter. The 2" was purchased on John's recommendation and it is our most used filter. We also have a Astronomik UHC 1.25 filter, but we have very rarely used it since getting the DGM'S
In our opinion you would be very happy with one of these filters.
David
