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Gaz,
I own the Sirius Optics PC and the CE filters. They each do a reasonable
job optically within the limited paramaters they are designed to work. I
haven't tried the Narrowband filter (NEB-1).
The Sirius optics filters are surface coated and certainly not the
most robust of creatures. The data sheet recommends leaving them
attached to an eyepiece to minimise the risk of damage, that rang
alarm bells at me straight away.
I think they are certainly reasonable filters but on the other hand I
think there are better options available for a little bit more money, namely
the Baader UHC-S for about $115. May not be optically a lot better than
the Sirius Optics but certainly a lot more durable physically. If you want the best the Lumicon and Astronomiks UHC's are superb, but well over $150.
Mike, Houghy and I have the DGM Optics NPB filter coming from
the USA. It has received very favourable reviews. Why not wait
till these arrive, try them for yourself and if you like it order one.
The DGM NPB would cost you about $AUS80 landed in AUS. That's
whilst they remain at the special discounted price. Mike has a 1.25"
coming and Houghy and I have the 2" version coming.
CS- John B
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