Thanks everyone..
Bert, reasonably dark - about 2 hours from Perth where you can still see the glow of Perth on the north-west horizon extending up perhaps 30 degrees. I'd rate it about 8/10 in the darkness stakes. The only filter was the minus-uv that I always forget to take off the lens for astro shots (the standard type used for daytime photography and protecting good lenses).
Roger.
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