Hi WR
Plenty of information previously posted. Try this thread:-
http://www.iceinspace.com.au/forum/s...ad.php?t=28725
and this one:-
http://www.iceinspace.com.au/forum/s...ad.php?t=27821
Here is a site re coloured filters:-
http://sciastro.net/portia/advice/filters.htm
Happy reading. Let us know whether you do find a good use for them.
