Guest Madatter Posted October 3, 2012 Share Posted October 3, 2012 Can someone please tell me what this is for? There was one exactly the same attached to the end off an eyepiece I have, the eyepiece didn't come with my telescope and I cant remember where I got it from. http://www.astroshop.eu/broadband-filters/seben-orbinar-deep-sky-filter-dsf-v/p,4923 Thanks Link to comment Share on other sites More sharing options...
Brantuk Posted October 3, 2012 Share Posted October 3, 2012 There's no description of what it's supposed to do and the term "Deep Sky Filter" is somewhat vague to say the least. What does it filter exactly? No one knows. And I'm filled with suspicion cos it has that mystic word "Seben" in front of it which generally suggests "con" or "tat" or "low grade" as far as astronomy gear is concerned. Little surprise it's no longer available. At best it's a light pollution filter which you can get a proper one for around £20. Link to comment Share on other sites More sharing options...
catman161 Posted October 3, 2012 Share Posted October 3, 2012 Just looks like a nebulae/skyglow filter to me. Gives better contrast by reducing background light and highlighting the object you're looking at. Link to comment Share on other sites More sharing options...
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