Quote Originally Posted by analoguey View Post
Got it. So something like this, or much closer in the inner circle?

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Well, how far off level does half a bubble out of the circle represent? A precision level has this calibrated.
The trouble is, I don't know your camera, or how to zero those levels. You can use a torpedo level to get them closer, but then you could just use the torpedo on the camera itself to level it - the torpedo, if a good one such as a Stabila, would be far more sensitive and accurate than those wee tiny bubbles. Actually that's not quite fair, the round bubbles can be decent if well made. But they're still no substitute for a proper level, which you don't really need very often.