"David Knisely" wrote in message
...

Well, to some extent the broadband "LPR" filters do help, although they
are
not miracle workers by any means. They tend to perform better under
darker
skies, but even then, usually they only provide a rather modest gain in
contrast. However, there are other types of filters which are also useful
mainly for emission nebulae: narrow-band and line filters. These do
greatly
enhance the contrast of many nebulae if used under the proper
circumstances.
Here is some information about them attached below (a simple text
file).
Clear skies to you.

--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/


Thanks alot for the thorough info :-)

clear dark skies
Søren