Categories

Blogroll

Latest Photos

Stacks of Duncansby Road to Wick
Caithness Duncansby Head

Latest Astro

Jupiter and Moons Jupiter
NGC 1647 L 91

Latest Movies

Comet Lulin Sledging
Partial Eclipse Daphne

Please install Flash and turn on Javascript.

Jun18

LRGB

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 …

Read More

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

Page 1 of 1

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

Nice post admin. Hello everyone, it’s my first view go to see at this site,
this site is very informative and more helpful for all people in the whole
world and this site paragraph is such a genuinely fruitful in support of me,
and other peoples. keep up posting such type of contents. Thanks again admin
https://www.downloadvidmate.com/vidmate-for-iphone/

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)
f/5
20 mm (0.79 in)
33 x
10 mm (0.39 in)
2   65 x
Built-on StarPointer
307 x
19 x
13.1
1.07 arc seconds
0.89 arc seconds
(Compared to human eye)  345 x

Page 1 of 1