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I had a quick peek at the Veil last night. A very poor night, with 88% humidity making it like observing from the bottom of a swimming pool. The brightest, western section (around 52 Cyg) was easy with the OIII filter, but very difficult without. On a good night, I don't need the filter. The eastern curve was visible but dim with the filter and invisible without.
FWIW, I've never found the OIII filter to be of the least use when looking for the North America Nebula.
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