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Old 29-08-2013, 12:56 PM
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h0ughy (David)
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Filters

Looking at the world of imaging filters it’s an eye opener for such a narrow view of the world. While looking into the world of mono, it struck me what do I get?

I will be upfront and say if you were looking at getting a complete filter set on a budget what would you choose – let’s say you had a 10 spot filter wheel? What would you fill it with?
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Old 29-08-2013, 03:12 PM
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multiweb (Marc)
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Baader Ha, Oiii, Nii, Sii, IR, Lum, Red, Green, Blue, UV/IR block.
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Old 29-08-2013, 03:56 PM
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What do you want to image?

I have L R G B Ha B V R I

I'm not interested in narrow band as I have no light pollution. I do like photometry though hence the photometry filters.
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Old 29-08-2013, 04:04 PM
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Bassnut (Fred)
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Quote:
Originally Posted by multiweb View Post
Baader Ha, Oiii, Nii, Sii, IR, Lum, Red, Green, Blue, UV/IR block.
Ditto, good choice.........except Astrodon
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Old 29-08-2013, 07:26 PM
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h0ughy (David)
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so what is NII used for?
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Old 29-08-2013, 07:45 PM
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so what is NII used for?
http://www.astrodon.com/Orphan/astro...arrowband/#h15
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Old 29-08-2013, 07:48 PM
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Quote:
Originally Posted by h0ughy View Post
so what is NII used for?
http://www.astrodon.com/Orphan/astro...arrowband/#h15

Rick beat me by seconds.
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Old 29-08-2013, 07:53 PM
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Sorry, Andrew. It's usually me that's too late
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Old 29-08-2013, 09:40 PM
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I used both Baader, Astronomiks and Astrodon (Gen 1 and Gen 2).

I prefer the Astrodons as they are easier to get balanced colour and quite parfocal (within reason).
Baaders are quite good and have very good red response, are less parfocal despite the claim and I had a 7nm Ha filter which was defective. I have some Astronomiks and they have good colour balance, are cheaper, thinner (they need spacers to fit in filter wheels) and I found they gave good star colours.

So any of those 3, I think are good. Astronomiks are the cheapest I think. Mike S uses Astronomiks.

You can get great results from any of them. Astronomiks are the cheapest.

Greg.
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Old 30-08-2013, 06:04 AM
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Well, I'm just going through this exercise myself and I'm going with Baader as a compromise.

First, I think the lum filter Baader offers is IR blocking (which in my case is essential for a refractor). The narrow band filters also seem to be a compromise in bandwidth compared to Astronomiks (wide) and Astrodon (quite narrow), and price wise fall into a somewhat middle ground which also makes sense. It didn't hurt that there are some beautiful test photos using a TEC140 with Baader either.)

But, my main reason for going this way over Astronomik is the slight notch between Red/Green to deal with Sodium light pollution which the Astronomik's don't have. The Astrodon filters have this notch (larger!) as well but cost much more. I plan to try either a Hutech or Astronimik CLS light Pollution filter in place of the luminance filter. This combination of filters might provide a reasonable light pollution combination but does not address Mercury LP...

I have tentatively compared both Hutech and Astronomik LP filters using a light box...perhaps not a fair way to compare. Compared to using no filter at all the Hutech takes 2X the exposure length to reach the same adu, the CLS 3.4X (big surprise!)

Peter
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