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Rob, do you do your observing from a dark site? I can then see why a neb. filter might not be too much help. I find them invaluble from my home though. Even when I used the OIII with the 2", it did help clean up the light pollution. I too found at a dark site, filters where, well, "so what" more or less. For some details they can help but the image neat is excellent with out a filter.
The dark pillars I mentioned in my previous post are those related to Bok Globuals. They rise into the brighter part of the nebula like half a dozen black, skeletal fingers, knotty and knarly.
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