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Hi Bob,
When directly viewing nebulae & supernova remnants from truely dark skies, I don't use DSO filters at all .... since the dark sky already gives excellent contrast. Having said that, a DSO filter will still offer a slightly alternate view (eg. accentuating dust lanes in a nebula).
Note that you will not see any colour, since the faintness of the objects will only activate the cones in your eyes (monochrome), but not the rods. To see all of the beautiful colours in DSO, astrophotography is the way to go ... lots of example photos in these forums.
Hope this helps.
Cheers,
Jeff
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