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Hi Matt,
I have Astronomiks UHC and OIII filters in 1.25" format and the DGM Optics NPB in 2" format.
The DGM NPB is a bit of a hybrid between a UHC and OIII. It has basically the same bandpass as an OIII filter extended a bit more than a normal OIII in both directions around the OIII lines. A normal UHC filter extends this same bandpass a good bit more either side of the OIII lines. In addition the Astronomiks UHC has an additional bandpass in H-Alpha.
What does all this mean, that on some types of targets one filter will outperform the other a little.
I dooubt that on an overall basis, it's quite as good as the Astronomiks filters but it is a very good Narrowband filter and you will be very happy with it. At less than 50% of the cost of the Astronomiks filters it represents easily the best value for money and a great buy.
If I was buying my first DSO filter, it is certainly the one I would be buying.
CS-John B
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