A nebula like in 'Lord of the Rings' that I found on 'www.radiationastrometry/nebulas-wikiversity.com' has coordinates of J2000 RA: 18h 11m 05s and Dec: -28* 58' 59" in Sagittarius .. but I found it in MaximDL Pro as ' Mi1-42 ' and is 14"arc-sec and 13th magn. but I didn't try to image it yet . The Cat's Eye nebula done by the Hubble on this site says it used a 630nm filter for 'neutral oxygen' which must be 'orange' so OPTCorp has one for $22.00 and free shipping as a 2" filter , so I will try it for the orange ends of the nebula .... a Minus-Violet filter ejects 630nm as a light pollution nm so it might not get the orange color .x
Your web site address is invalid. The filter may not be narrow enough to work, unless you have really dark skies and no light pollution. Typically the higher quality filters tend to cost a few hundred to a few thousand dollars. Good luck though - will be interested to see what you come up with.
