I do quite a lot of low light and night photography. One irritation is sodium light pollution. I have heard that there is a sodium filter available but I cannot seem to find a Cokin p type to do this. Any users cracked this one?
Badgerballs Senior Member ![]() 482 posts Likes: 1 Joined Jan 2005 Location: East Sussex, England More info       | Apr 04, 2011 06:42 | #1 I do quite a lot of low light and night photography. One irritation is sodium light pollution. I have heard that there is a sodium filter available but I cannot seem to find a Cokin p type to do this. Any users cracked this one? "Try shooting badgers, creep up in the dark, they hear the shutter, the flash goes off, they run, and what's the shot... "Badgerballs" !!!!
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GPFocussed Senior Member ![]() 583 posts Joined Jan 2009 Location: Canada More info       | Apr 04, 2011 07:02 | #2 Interesting topic, subscribed. I don't do a lot of night photography but I typically adjust my white balance until I get a desired effect. [URL="http://photography-on-the.net/forum/Gear List"][URL="http://photography-on-the.net/forum/showpost.php?p=9541640&postcount=2194"]Gear List
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xhack Goldmember ![]() 1,283 posts Likes: 2 Joined Jul 2007 Location: Edinburgh, Lothian More info       | Apr 04, 2011 07:04 | #3 I have a custom WB for sodium light saved on most cards. Subjectively, I found 12 per cent gives more accurate rendition than 18 per cent. It's not a perfect solution, but gives you a start which you can further tweak in PP ~ Wallace
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SkipD Cream of the Crop ![]() 20,471 posts Likes: 151 Joined Dec 2002 Location: Southeastern WI, USA More info       | Apr 04, 2011 07:31 | #4 Badgerballs wrote in post #12153708 ![]() I do quite a lot of low light and night photography. One irritation is sodium light pollution. I have heard that there is a sodium filter available but I cannot seem to find a Cokin p type to do this. Any users cracked this one? What would the filter you have in mind do for you? Skip Douglas
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Badgerballs THREAD STARTER Senior Member ![]() 482 posts Likes: 1 Joined Jan 2005 Location: East Sussex, England More info       | Apr 04, 2011 07:37 | #5 SkipD wrote in post #12153856 ![]() What would the filter you have in mind do for you? Anything that you can do with filters for "white balance correction" can be done more easily in software when working with digital images - especially if you shoot in RAW mode. Sodium vapor lights, as well as other types of gas-discharge lighting, do not have a full spectrum of colors in the light. It's impossible to get all the colors in the subject (which might be seen in daylight or with flash lighting) to show properly when the subject is illuminated with sodium vapor lighting. Well I need to research this more as the information I saw was on an Astronomy program. A sodium filter apparently prevents the sodium wavelengths from entering the CMOS much the such as infra red filters. White balance adjustment will only change the colour cast to match your required preference. I am looking to remove the sodium light waves completely. "Try shooting badgers, creep up in the dark, they hear the shutter, the flash goes off, they run, and what's the shot... "Badgerballs" !!!!
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yogestee "my posts can be a little colourful" ![]() More info       | The problem with adding a filter in front of your lens is you can lose some image quality.. Also,, with any colour correction filter you will lose light entering your lens, and with lowlight photography, you need all the light you can muster.. Jurgen
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Badgerballs THREAD STARTER Senior Member ![]() 482 posts Likes: 1 Joined Jan 2005 Location: East Sussex, England More info       | Apr 04, 2011 08:09 | #7 When you take a picture on long exposure and have sodium lights around I have noticed you get a large haze appear around it. This is obviously where the light is being absorbed into the dust etc. The theory supports that if you can filter out the wavelength apparently 589nm them the lights would in my mind appear more defined and easier to remove in PP. I found this interesting link "Try shooting badgers, creep up in the dark, they hear the shutter, the flash goes off, they run, and what's the shot... "Badgerballs" !!!!
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      | Apr 04, 2011 08:09 | #8 Badgerballs wrote in post #12153866 ![]() Well I need to research this more as the information I saw was on an Astronomy program. A sodium filter apparently prevents the sodium wavelengths from entering the CMOS much the such as infra red filters. White balance adjustment will only change the colour cast to match your required preference. I am looking to remove the sodium light waves completely. Yes, there are astronomy filters that will remove the sodium light. I've no idea what effect they might have on ordinary photography. As long as your scene had alternative lighting then it might work. Frank Hollis - Retired mass spectroscopist
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Badgerballs THREAD STARTER Senior Member ![]() 482 posts Likes: 1 Joined Jan 2005 Location: East Sussex, England More info       | Apr 04, 2011 09:21 | #9 hollis_f wrote in post #12153971 ![]() Yes, there are astronomy filters that will remove the sodium light. I've no idea what effect they might have on ordinary photography. As long as your scene had alternative lighting then it might work. I've always fancied trying one of these Astronomik filters ![]() Wow that looks interesting I will have to have a read of it. Yet another avenue of photography to explore. They are endless "Try shooting badgers, creep up in the dark, they hear the shutter, the flash goes off, they run, and what's the shot... "Badgerballs" !!!!
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      | Apr 07, 2011 07:26 | #10 Badgerballs wrote in post #12154325 ![]() Wow that looks interesting I will have to have a read of it. Yet another avenue of photography to explore. They are endless ![]() Well, I gave in and ordered one - £110 from Rother Valley And with the filter... Then with the filter and the white-balance set in Lightroom. It looks OK with the WB set properly. I'll try to get some shots taken tonight to see how it does with light pollution. Frank Hollis - Retired mass spectroscopist
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      | Apr 28, 2012 22:32 | #11 hollis_f wrote in post #12175388 ![]() Well, I gave in and ordered one - £110 from Rother Valley ![]() It does muck up the colours. Here's a colour chart without the filter - ![]() And with the filter... ![]() Then with the filter and the white-balance set in Lightroom. ![]() It looks OK with the WB set properly. I'll try to get some shots taken tonight to see how it does with light pollution. Hey so did you do a follow up to this? I would really like to see pictures, I know the thread is kinda old but very beneficial for me at the moment. Wes
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AntonLargiader Goldmember ![]() 1,825 posts Joined Oct 2010 Location: Charlottesville, VA More info       | Apr 29, 2012 08:25 | #12 Interesting to see the orange being removed. Orange becomes red, but yellow becomes orange. T2i . 18-55 IS . 70-300 IS USM . 70-200 2.8L IS . 28mm 1.8 . 100 Macro . 430EX II . TT1/TT5 . Bogen/Manfrotto 3021 w/3265 ball-mount
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