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Thread: DSO filter?

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    Default DSO filter?



    Loving the DSO's....... Is there a filter that helps with them?
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    Default Re: DSO filter?

    I'm assuming your query is about filters for visual use. Visual use filters and DSOs are a bit problematic. Filters introduce yet another optical surface through which light has to pass, not all of it makes it through. For that reason filters will make already dim DSOs even dimmer, a situation most of us choose not to experience. Now that doesn't mean we don't use filters, it just means that their use is pretty limited. For example, an OIII filter works wonderfully on oxygen rich objects like the Veil nebula, but can only truly be appreciated at a very dark location. The reason being that the OIII filter darkens the entire FOV. If you use a UHC filter, it will produce better contrast but also a dimmer image. So you begin to see the problem associated with using filters on DSOs.

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    Default Re: DSO filter?

    Doug, see this recent thread: OIII vs. UHC
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    Default Re: DSO filter?

    I use and enjoy the DGM NPB filter. Has really improved my views of the Swan nebula, Orion nebula, Lagoon nebula, as well as many planetary nebula. Won't help with galaxies though.
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    Default Re: DSO filter?

    Quote Originally Posted by bladekeeper View Post
    Doug, see this recent thread: OIII vs. UHC
    Looks like the UHC is the all around best huh. Was thinking something that had more contrast to it. After I posted this I was thinking (and was reminded by another member) that our local club I m with has a loaner set. Will have to get with them and try them out to see which filters I might like to buy.
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    Default Re: DSO filter?

    That's one of the great things about a local club and nothing beats hands on experience. I have a few filters and get good results from them but it is sparing and very target specific.
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    Default Re: DSO filter?

    Quote Originally Posted by BrokeStarGazer View Post
    Looks like the UHC is the all around best huh. Was thinking something that had more contrast to it. After I posted this I was thinking (and was reminded by another member) that our local club I m with has a loaner set. Will have to get with them and try them out to see which filters I might like to buy.
    Maybe an EP with more contrast for your scope?

    IF by DSO's you mean galaxies, there isn't much in the way of filters that will make a huge difference...Both the UHC and O-III filters and the Ha filters can be quite helpful with increasing details on nebulous DSO's......

    You may be able to "test drive" filters and different EP's at your local astronomy club meets....Nothing like hands on experience before you buy !!
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    Default Re: DSO filter?

    The DGM NPB filter works well with nebulas. As stated before it does cut some of the light but with better views of some nebulas it's a reasonable trade off for me.
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