Orthographic Camera Display Size issue

An orthographic camera with a zoom of 1 and camera.left -10 camera.right +10 should fully display a grid of size 20units.

For some reason it ain’t working like this. If I wan’t a camera size of 20units being shown than I either need a zoom level of 0.5 or camera.left -20 right +20.

Where is my mistake?

I use Three R124

Please provide working live code like in JSFiddle or CodePen, which demonstrates your issue…

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