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Three further comments about this:
1) Les's 5mm exit pupil is a key tip for this object. So in an F/5 scope, that means an eyepiece around 25mm focal length.
2) I think you'll need a very transparent night to see it in a 12" scope (although it is definitely possible). I found it a fairly marginal object in my 14"; it is now relatively easy in the 20", which is to say we can spot it on any reasonably good night with either H-beta or UHC filter.
3) Make sure you get Zeta Orionis out of the field of view. It is glaring.
Phil
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