horsehead nebula filter

[icytailmark]

what is the best 2" filter to view the horsehead nebula from sydney? i would be using a 20 mm nagler type 5 in a 12" Dob.

[astro744]

H Beta filter. Lumicon make one but there are others. See http://www.lumicon.com/astronomy-accessories.php?cid=1&cn=Filters

You can get Astronomik locally from Bintel.

[koputai]

Mark, apparently you need an H-Beta filter. I scored myself one a while back but haven't had a chance to try it out.

Cheers,
Jason.

[mozzie]

ive an orion 2" h/beta nice filter

[pgc hunter]

I use an Astronomik H beta, it has allowed me to see the Horsehead from my outer suburban location with a 12".