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Originally Posted by cristian abarca
John I have a Sirius optics nebulae 1 filter and it works pretty well on my little scope.
Regards Cristian
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Hi Cristian,
One quick word of warning regarding the Sirius Optics filters. These filters are surface coated with the material on the eye lens side of the glass, which makes them very easily damaged. Sirius optics recommends leaving the filter permanently attached to an eyepiece to avoid the possibility of damage, or at least they did with the 2 I bought about 5 years ago. Optically the Sirius optics filters are pretty reasonable. The more expensive filters like Astronomiks and Lumicon are "sandwich filters" with the filter material sandwiched between 2 layers of glass, these filters are extremely durable. The Astronomiks has a 5 year guarantee.
To John,
If your can't afford the Astronomiks or Lumicon the Baader filters do a pretty good job, remember of course you usually get what you pay for in life.
Another option is the DGM Optics NPB filter, I have a friend in the US that I greatly respect who rates this the best narrowband filter he has used and he just recently tested 25 of them for a magazine review.
http://users.erols.com/dgmoptics/
This filter would only cost you about $100 by the time you import it from USA. I haven't used one myself. Of the multitudes I have tried I rate the Astronomics UHC and OIII very highly.
CS-John B