secondary focus

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secondary focus [′sek·ən‚der·ē ′fō·kəs]

(optics)

In an astigmatic system, a line at which some of the bundle of rays from an off-axis point meet; this line lies in a plane which contains the point and the optical axis, and has a greater image distance than the primary focus. Also known as sagittal focus.

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astigmatic difference

astigmatic interval

primary focus

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