Jump to content

What is a nebula filter?

farunj

Recommended Posts

DirkSteele

DirkSteele

Posted
Posted

Emission nebula tend to radiate at specific wavelengths of light such as the Oxygen III , and Hydrogen Alpha and Beta lines. Quantum physics at work. ;)

DSO observing is all about the contrast between the object you are trying to observe and the sky background. You obviously want to maximise this. Nebula filters have fairly narrow bandpass around these wavelengths and block the rest of visible spectrum which has the effect of darkening the sky background relative to the object you want to observe.

Link to comment
Share on other sites
glowjet

glowjet

Posted
Posted

A Baader UHC-s or other quality makes, I understand the Sky Watcher one gives very good results. However, you do not give us any idea what your scope size is, as a filter of this calibre it is only useful in scopes of 100mm upwards and then used from a reasonably dark site to bring out the best HTH :)

Link to comment
Share on other sites
farunj

farunj

Posted
  • Author
Posted
A Baader UHC-s or other quality makes, I understand the Sky Watcher one gives very good results. However, you do not give us any idea what your scope size is, as a filter of this calibre it is only useful in scopes of 100mm upwards and then used from a reasonably dark site to bring out the best HTH :)

I am going to buy a SW 200p. As of now I have a Startracker system. It's a 5" f/7.2 reflector.

Link to comment
Share on other sites
farunj

farunj

Posted
  • Author
Posted
If your goal is purely to improve your views of Nebula, UHC will have the biggest contrast gain.

I want to buy a filter that will let me view nebulae as well as galaxies fairly well. Because I live in an area that has some amount of LP.

Link to comment
Share on other sites
rwilkey

rwilkey

Posted
Posted

No filter on the market will allow you to view galaxies better, you need a dark sky spot for this. I recommend the SW UHC filter for emmision nebula, as it will make a great difference, esp. in the 200P. The OIII is also a good filter for the more diffuse nebula. Make sure you are looking at 'visual' filters when shopping and not CCD filters! See also this link about filters: http://www.lumiconfilters.com/index.php

Link to comment
Share on other sites
farunj

farunj

Posted
  • Author
Posted
The skywatcher appears to be out of stock on FLO, but I've seen good things about the castell uhc deepsky filter. And its cheaper at 36 quid from 365astronomy.

I'll be getting that 1...

I have to get my scope first. Then will think of the filter. Just wanted to know what types are good!! :)

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.