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Yes it is hard to get anything but Nebulae looking right with a Hutech Neb Filter.
If you look at the picture below they are transmission spectra in glorious colour of various filters.I put this together some time ago using a grating and the 20D.
From the top
Denko 'H Alpha'
Hutech Nebular filter
Nebular Filter brand unknown from R Davis eons ago
Hutech LPR Filter
Mercury (Hg) Lamp ie (streetlight)
High Pressure Sodium Lamp (streetlight)
Tungsten Globe
As you can see there is no yellow passed by the Hutech NF. If you push the yellow in colour balance a nasty green cast appears as well as 'yellow'.
Bert
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