I'd definitely be trying with the 16" dob over the 4" refractor. The CLS filter may be a bit too broad to offer much contrast, so the UHC is probably the better choice, depending on the breadth of transmission. An OIII, if you can get your hands on one, would be ever better again I think - last weekend I was viewing the veil from SW of Brisbane, and the OIII was markedly better than my UHC. With the veil so low on your horizon, you'll need all the contrast you can get, battling through that much atmosphere. If you can pull it off, it's a really great piece of the sky - the wispy flame-like filament flowing off the end of 52Cyg is a highlight. Good luck!
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