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Posts: 2,220 | Thanked: 3,778 times | Joined on Jun 2010 @ Florida
I've thought about using the lense focus length to measure stuff - it's extremely simple math (rudimentary geometry and algebra) to calculate it from there.

But at least using the Camera UI replacement included in CSSU, I have not seen the measurements to be too reliable... I've pointed it at a wall and focused, then mesures the actual distance from camera to wall, and there's definitely almost always some discrepancy. Though the Metre App linked to earlier seems to have implemented what I'm talking about already, and decently well. *Shrug*

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