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If you look through the lens at a distant point, the point image will not move when the lens is rotated slightly about a vertical or horizontal axis the goes through the nodal point. This is called the optical center.

With a thin lens this is close to the geometric center, with a longer complex lens the optical center is buried somewhere inside. The optcial center of a complex lens may or may not be inside an element.

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13y ago
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16y ago

In my experience, generally I known optical center of the lens is the thinnest point of minus lens or the thickest point of plus lens. And in that point (optical center) we can see directly through the lens without any distortion, if the power (dioptry) of lens is correct for your eye. Also we can find it (optical center) by used lensmeter.

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12y ago

outer edge of the lens

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