Beginner qns.
Beginner qns.
Hi guys, after buying a refractor telescope, i noticed that every time i look at something, that would be a blue hue around the object. How can i fix it? Thanks for viewing.
- Clifford60
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Re: Beginner qns.
I guess that is CA and your refractors telescope is an Achromatic refractors and not an Apochromatic refractors.
http://en.wikipedia.org/wiki/Refracting_telescope
http://en.wikipedia.org/wiki/Refracting_telescope
- cloud_cover
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Re: Beginner qns.
You can fix it in a few ways:
1. Get a minus violet or Baader Semi-APO filter - will darken the image a bit
2. Use a UHC filter (strictly for nebulae and will severely darken the image even as it increases contrast)
3. Stop down your telescope: This increases the effective focal ratio and the higher the focal ratio, the less apparent the CA in a telescope.
4. Use lower powers: The lower the power the less the CA
5. Don't look at bright objects - CA is more apparent on bright objects
6. Get an ED/APO or reflector
1. Get a minus violet or Baader Semi-APO filter - will darken the image a bit
2. Use a UHC filter (strictly for nebulae and will severely darken the image even as it increases contrast)
3. Stop down your telescope: This increases the effective focal ratio and the higher the focal ratio, the less apparent the CA in a telescope.
4. Use lower powers: The lower the power the less the CA
5. Don't look at bright objects - CA is more apparent on bright objects
6. Get an ED/APO or reflector
DON'T PANIC
Re: Beginner qns.
Thanks for your quick ans guys.