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Thread: Need help with UHC filter

  1. #1
    SuitedHound's Avatar
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    Default Need help with UHC filter



    I just bought the Celestron 1.25" Ultra High Contrast (UHC) Light Pollution Reduction Filter and screwed it onto my Meade 5000 14mm. Unfortunately, when looking at the orion nebula, I see no difference in color, it's still grey; please help.
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    Default Re: Need help with UHC filter

    The filter won't give you any more color. It increases contrast and hence makes certain fainter objects easier to see with averted vision. It is quite natural for Orion to look grey with our eyes.
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    Default Re: Need help with UHC filter

    We see DSOs as grey because there is not enough light for our eyes to pick out color. We can see much dimmer light in black and white.

    Filters only block (hopefully unwanted) light, they do not add anything like enough light to see color. It takes a trained eye to make out the subtle difference the filter will make. It will work best in a larger aperture scope.
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    Default Re: Need help with UHC filter

    Oh ok, thanks guys!

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    Default Re: Need help with UHC filter

    SuitedHound, try this next time to see what this filter does.

    Pull up the Orion Nebula. Look at it carefully without the filter first. See how clear the strings of material is. Next put your filter in an re-examine the nebula. The overall image may, will be dimmer, but the glow of the nebula should be more obvious as will the string-like extensions.

    Take your time with ALL filters. What they reveal may not be immediately obvious. In some cases what you are looking for may actually appear opposite to how you expect. Nebula filters and colur filters are very specialized. Like Ozman said, they work by eliminating certain wavelengths and transmitting very specific ones. With nebula filters, it is by transmitting the VERY specific wavelengths that nebulae glow at. They are either reflecting light (blue), or emitting light (red) due to the gas being ionised - that means the gas is actually flourecing due to the energy of big nearby stars, and this happens at very exact wavelengths for hydrogen and oxygen. This is why we only see photos of nebulae in red and/or green. Other colours are due to post processing techniques being used.

    Alex.
    Last edited by mental4astro; 01-08-2017 at 05:10 AM.

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    Default Re: Need help with UHC filter

    I agree with the above but would say that green in space from what I've captured in pictures and to my eyes anyways is only found in comet heads. I see in my straight out of camera RAW files mostly red/pink/magenta emission nebula or blue reflection nebula if that region has anything like that at all. I totally agree that taking your time when gazing is very important. That and trying to get to the darkest area to gaze that you can. The more you look the more you find. Have fun out there!
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    Default Re: Need help with UHC filter

    The UHC filter is a kind of light pollution filter. It blocks sections of the visible spectrum most affected by emission from mercury and sodium street lights, but lets most other light through.

    The "catch" with these things is that any time you block any light at all... the image gets darker. So while they technically do reduce light pollution and boost contrast, because of the trade-off of the image becoming darker, you may not necessarily like what it does when it's used for visual astronomy.

    If you do imaging, these things and wonderful. I have the Lumicon version of the filter which has an overall "blue" color cast to the background sky. I've used (but do not own) the Orion version of the filter and I find the image has a very slight green color cast, but overall the color is actually pretty good.

    You typically will not see color through a telescope when looking at deep sky objects. Some younger viewers detect color but the sensitivity tends to degrade with age.
    Tim Campbell


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