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Message: <blockquote data-quote="fwm891" data-source="post: 502407" data-attributes="member: 40761">Essentially it's trial and error to fine tune things. I start with a spot meter reading and an underexposure setting of - 2 stops and place the spot just above the horizon. That usually ensures I'm close.So much depends on the local sky conditions and how much muck is floating around to catch the predawn light and how high above the horizon it stretches. Your latitude will also effect things at different times of the year. Winter in high latitudes will be different to winter at 25-30° latitude. Ditto summer etc.Tripod and remote release definitely needed.</blockquote>