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Pullution Filter.

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5 replies to this topic

#1 Mr Star

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Posted 21 March 2019 - 07:09 AM

Just wanted to know if I needed a Pollution filter for Astrophotography. I live in a suburb in a small town with fields mostly around me. We have a few street lamps but orange colour. MY site is class 5 Bortle. I know alot of people live in a big city and have huge problems with light pollution.

 

If so what do you recommend. Using a f6.5 700mm 107 triplet with asi1600mm pro cooled.

 

Regards



#2 sg6

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Posted 21 March 2019 - 07:51 AM

If the lights are Orange that implies the "old" sodium lights and to an extent they are easy. You get a sort of classic LP filter which blocks the 2 close Na emission lines.

 

Once you get to thinking of "whiter" light the troubles start.

 

As I suspect a simple sodium LP irlter is not overly costly it reads that it is worth you getting one and determining its usefulness..

 

Rememebr that any filter removes something, in this case any wavelength close to the Na emission, so that yellow portion is blocked and so you get an image that is slightly deficent in yellow. Not sure of the result with a mono camera as you appear to be taking a single polychromatic (color) image with a mono camera.

 

Is it as I half suspect a case of taking an OSC image with a mono camera, at least until the filter wheel and filters make an appearance in your imaging journey?



#3 happylimpet

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Posted 21 March 2019 - 09:14 AM

High pressure sodium (HPS)  lights, which emit a whole lot more than just the 2 close lines, are also kind of orange.....but fingers crossed! Theyre also blockable to some extent, just not as well as the old LPS.



#4 Eric Seavey

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Posted 21 March 2019 - 02:30 PM

Looks like you have a Canon 450D from your signature line.  Do you have your asi1600 camera yet?  Is it a OSC?  I think that camera has an AR glass panel only.  So you will always need an IRUV cut filter, and when using a light pollution filter, you need the CLS-CCD filter (not the CLS).



#5 Mr Star

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Posted 21 March 2019 - 04:59 PM

Hi thanks for the info guys. The list I have in my Sig. Line I still have but i am refering to my equipment i just bought plus i have the 8 position automatic filter wheel and 7 filters. RGBL ha o3 and Sulphur all 1.25.  I also have an alair 60mm finder scope with the altair 130c guide camera.

 

This is my first time with AP I normally just view through my SCT 1100 XLT. Question is what filter do you recommend and where do I actually put it in the setup.

 

I will be away for a few days but will be back on Monday. So please don't think I am being rude by not getting back to you straight away.

 

Kindest regards David



#6 Eric Seavey

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Posted 21 March 2019 - 05:46 PM

Hi thanks for the info guys. The list I have in my Sig. Line I still have but i am refering to my equipment i just bought plus i have the 8 position automatic filter wheel and 7 filters. RGBL ha o3 and Sulphur all 1.25.  I also have an alair 60mm finder scope with the altair 130c guide camera.

 

This is my first time with AP I normally just view through my SCT 1100 XLT. Question is what filter do you recommend and where do I actually put it in the setup.

 

I will be away for a few days but will be back on Monday. So please don't think I am being rude by not getting back to you straight away.

 

Kindest regards David

Most people do not use a light pollution with a mono camera. 




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