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Many years ago before lots of tech was available we used the 6th Mag star in the coal sack as guide. When you can see the 6th mag star you are in a fairly dark sky location. I reckon that would be a better start than using cameras as a guide. Though an SQM is about as good as it gets, but you would need to remember that some nights the sodium layer is more agitated than other nights and that can affect the readings of how dark the sky is on any particular night. I saw an interesting lecture my David Malin last year about the colour of the night sky and what causes it to become milky. My site is about 21.6 on average with an SQM and I have seen a night of 22.06 before. On nights when the sky looks a little milky I get readings of around 21.4. Generally though my site is dark with just some minor pollution on the horizon from Adelaide.
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