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a horse of course
If anyone out there in viewer land is wondering what other objects these specialised and expensive rejection filters are good for, Mike Kerr of the ASNSW advises me that the objects best observed with the H-beta filter are:
IC 405 (Flaming Star Nebula)
NGC 2023/B33 (Horsehead Nebula)
LDN 1613 (Cone Nebula)
Sh2-296 (Seagull Nebula)
AG Car
RCW 58
Ced 130 (Sigma Sco)
NGC 6559
NGC 1499 (California Nebula)
These are all fairly faint objects.
If the dark nebula B33 was not such an iconic object that graces the pages of many if not most astronomy books, it would be all but ignored, much like Be146/ngc5367 in Centaurus.
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