Petzval field curvature

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Notion

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Science and technology

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What Wikipedia says

Petzval field curvature, named for Joseph Petzval, describes the optical aberration in which a flat object normal to the optical axis (or a non-flat object past the hyperfocal distance) cannot be brought properly into focus on a flat image plane.

Excerpt from the Wikipedia article “Petzval field curvature”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: BenFrantzDale, CC BY-SA 3.0, via Wikimedia Commons.