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5 comments posted in: Buttons

I’ve invested in some colour filters and a filter wheel for my astroimaging setup so I’m going to be posting some colour astroimages up over the coming months, I’ve already posted my first LRGB image of M27 into the gallery.

I thought I’d take a few words to explain how this works. The CCD camera I have is monochrome, these are generally better then singleshot colour cameras as they have a higher resolution and there are no filters in front of the chip. So to get monochrome images it’s just a case of capturing multiple exposures and stacking them in software to increase the signal to noise ratio. To get colour you need to take monochrome images through red, green and blue filters. The filters are very precisely made so they only pass through the correct wavelengths, they also block any infrared light which the cameras are sensitive to and can cause problems. They are also manufactured to ensure that they focus the light from the telescope to the same place, so you don’t have to refocus when you change filters.

The filters are held in a filterwheel, this is a mechanical device driven by batteries that rotates …

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Posted: Wednesday, Jun 18, 2008 at 01:52 PM by jochta

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Posted by Spotting Scope on Mon, August, 14, 2017 - 04:15 AM

Thanks, This article is very helpful.

Posted by Eloise Thorpe on Wed, August, 16, 2017 - 10:49 AM

It is very helpful to gain awesome tips. This information is useful.

Posted by Amit on Tue, March, 20, 2018 - 10:40 AM

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Posted by indoxvx on Mon, April, 30, 2018 - 08:30 PM

Thanks for sharing with us

Posted by Telescopes on Sun, July, 15, 2018 - 12:22 PM

I am plannign to buy Celestron Astromaster 130 AZ Telescope
here is the specs suggest me good one
Newtonian Reflector
130 mm (5.12 in)
650 mm (26 in)
20 mm (0.79 in)
33 x
10 mm (0.39 in)
2   65 x
Built-on StarPointer
307 x
19 x
1.07 arc seconds
0.89 arc seconds
(Compared to human eye)  345 x

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