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Bob, I think for the Veil you want good transparency. Smoke or haze will have a pretty devastating effect on its visibility. Re OIII - this target in a crowded part of the sky so the filter makes it easier to see by sufficiently dimming its Milky Way neighbourhood. The filter obviously won't brighten it, so if it's dimmed too much to begin with, it wont make much of a difference.
M57 does look better sans filter for its context, the filter will just make it a little easier to find/identify.
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