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Posted by Bob Sal on September 18, 2003 18:29:35 UTC

I guess there's a difference from brand to brand, I havn't seen all the brands and compaired them to really give a valid assessment. I own 3 different ones myself and can tell you the difference there. I have a Meade OIII 2" which works great. It filters out most stars and probably all light polution yet lets the nebula shine through. Makes a very dark background so the nebula appears brighter. I've seen other OIII filters and they have pretty much the same effect. The Orion Ultra Block 1.25" is not as strong. It lets more stars shine through and still darkens the background enough to make a nebula very appearent. I really like that one. Still looks like you looking at the sky. I've seen several planetary nebulas with that filter I wouldn't have seen without it. Then I have the the Orion Skyglow. I just got this one and havn't used it yet. I have seen it in action before and it filter less than the Ultra Block. I'm hoping to use it on DSO's other than the nebulas since the light polution in my backyard has gotten much worst in the last 2 years. It advertises to be used in heavy light polution to darken the background and make DSO's look brighter especially nebulas. As soon as the weather clears and I get a chance to use it I'll post again. Good Luck.
That's it;
BOB SAL

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