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Steve - yes, it's similar to headroom in digital recording. That's precisely why studios do record in 24 bits in preparation for mastering in 16 bits. It's a good idea.
I actually don't know how it transfers to usage in AP to be honest. Haven't tried it yet, I'm waiting on scope and mount to arrive. But I've used both types extensively in regular photography and I can say it's a relief to be able to deliberately underexpose shots with the knowledge that detail isn't actually lost.
But claiming that battery life doesn't matter because you can just plug it in... yeah I totally and utterly disagree there.
Anyway. Raymo and I probably aren't destined to agree on this. My own experience and reading leads me to different conclusions than his experience and reading has. What's more, it's all beside the point! We're all shooting with entry-level DSLRs. We should be united in fist-pumps for the little guys of the camera world.
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