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Thread: Orion SkyGlow Broadband Light Pollution Filter

  1. #11
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    Quote Originally Posted by AbbN View Post
    Considering Orion sells it for $75, I'm thinking for $20, why not.

    Jennifer, you'd be horrified by the light in our front. Our street corners are very well lit
    I'd grab it in a heartbeat! At $20 bucks, that's a steal!!!!
    Chris
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  2. #12
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    He backed off on the filter cause a nephew of his just picked up a small scope so guess who's getting it instead. Based on the comments here I wasn't that eager for it.

    As "compensation" he gave me the Telrad for $20 - the thing was brand new in a box - he'd never used it!!!!! I'm satisfied It's going on the 8" Skywatcher. Unfortunately clouds are predicted for the next week

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  3. #13
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    I find filters a huge waste of money better spent on other gear. They do help you find things, but then they steal your light and detail as well.

  4. #14
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    Quote Originally Posted by TCA View Post
    I find filters a huge waste of money better spent on other gear. They do help you find things, but then they steal your light and detail as well.
    That's basically my interpretation from the comments here regarding this filter. Look at the bright side, I got the Telrad at even a better deal cause of his nephew - I'm sure it will get much more use than the filter would have

    Many thanks to all as your comments are all greatly appreciated more than I can express even thought at times I seem to ask pretty dumb questions !!!!!

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    I bought the Ultrablock when I first got into the hobby thinking it would make my light polluted area a dark site. No way!

    Even outside of my unrealistic expectations though it just didn't perform well. It made objects stand out from the rest of the sky, but gave me no benefit in structural detail or anything. It was ebayed after sitting in my case unused for a year.

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    Quote Originally Posted by AbbN View Post
    He backed off on the filter cause a nephew of his just picked up a small scope so guess who's getting it instead. Based on the comments here I wasn't that eager for it.

    As "compensation" he gave me the Telrad for $20 - the thing was brand new in a box - he'd never used it!!!!! I'm satisfied It's going on the 8" Skywatcher. Unfortunately clouds are predicted for the next week
    "Clouds Predicted for a week".... OF COURSE! LOL The hobby just wouldn't be any fun without a week of clouds or rain, after you get new gear!
    Chris
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    Quote Originally Posted by Dublin sky watch View Post
    They work BUT you need to be in a dark location to fully appreciate there value. They are not really light pollution filters(bad marketing or clever marketing) They are more nebulae filters and they can enhance your viewing of nebulae. But I would certainly not buy one on the idea that it will reduce light pollution only. Bottom line if you are viewing from the suburbs then I do not think they are worth the investment.
    I had always debated (internally) whether I wanted to invest in one of these or not. My understanding of the optics involved was that it would involve too much reduction of image light (overall) and not really address light pollution so I never chanced it. Now, I'm glad I didn't, thanks!
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    Quote Originally Posted by laney50w View Post
    "Clouds Predicted for a week".... OF COURSE! LOL The hobby just wouldn't be any fun without a week of clouds or rain, after you get new gear!
    Yeah, want to build my house at 80000 feet and just say goodbye to clouds forever!
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    Default Orion Skyglow filter usage

    Almost all skyglow filters are useful for helping objects step outside of the orange glow associated with typical light polluted areas but they also diminish quite a bit of light from the object as well--it all depends on the emitted color of light. For a test, I used a skyglow filter in my room and placed it up to my eye under fluorescent lights. They will eliminate almost all the color of light from anything near green or orange. It leaves behind the rest of the color spectrum though which is blues and reds. Anything in the blue or red zone is vitually untouched! There is absolutely no change, not even a 1/2 stop.

    The reason why skyglow filters are so ineffective in the city is because these filters can only filter selected bands out. It isn't a complete cut. There are still other bands of light produced from street lamps and even with enough of them concentrated in one area, it will still make it difficult to see past the light. The weather conditions will also affect the effectiveness. The sky contains lots of particles ranging from dust to humidity. In the summer, when seeing conditions are at their worst, a skyglow filter will do very little.

    As far as using a skyglow filter at a darksite, it will help highlight objects by cutting down the slight amount of present skyglow from nearby towns or cities. As long as a large amount of light emitted from the object falls outside of the cut zones, you will still see 90% of the object while the surrounding "space" will turn a dark blue unless it is already fairly dark--then you will see no change. Only the object being viewed will change color.

    The *BEST* use of a skyglow filter is for astrophotography in either the city or out in the sticks. Exposing for a longer period of time will always help because as you cut unwanted bands of light out, the accepted range flows freely unscathed. It will allow you to take more detailed shots of nebula and galaxies at the necessary ISO and exposure settings without blowing out the image with that nasty red/purple/pink color associated with overexposed mercury and sodium lighting. You won't see faint structures, but the brightest central mass will definitely show up better filtered than not filtered. It's just that for visual observation, skyglow filters really don't do that much.

    **Amended**
    Another fine use of the skyglow filter is for those of us dabbling with image intensified observations (night vision). If you are using a gen 2 or gen 3 device, this will help slightly with bringing out the selected light from an object as long as it falls within the intensifier's sensitivity range. Gen 2 can see a more well rounded range with the major sacrifice being less amplification and overall sensitivity, where Gen 3 can see copious amount of Infrared light, but cuts more of the blue spectrum out. In the city, this doesn't help too much but out at a darksite it will blow your socks off.
    Last edited by efahrenholz; 04-08-2011 at 03:29 AM. Reason: Addition of Intensified Astronomy under skyglow filters section

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    Old thread I know, but I have a question on the orion skyglow filter

    I recently got one, to see if it helped with the bit of industry to the NE of me, strong orange glow. But I've noticed the filter turns everything green, overpoweringly green...question is....it's this normal? Are these filters normally a strong green or do I have a dodgy/wrong filter?

    Thanks

    Rellikzephyr

 

 
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