Curvature of field

Curvature of Field
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Curvature of field
Lens aberration causing a curved plane of focus.
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Curvature of Field. This optical defect causes points on an object plane perpendicular to the lens axis to focus on a curved surface rather than a plane.
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APPENDIX I GLOSSARY ABERRATION -A defect in the formation of an optical image; for example, astigmatism, chromatic aberration, curvature of field, and so forth. ABSOLUTE TEMPERATURE-The temperature measured from absolute zero.

axis converges to form 3 focused image on the film. Spherical aberration is the term for an optical fault caused by the spherical form of a lens that produces different focus points along the axis for central and marginal rays.
b) Curvature of field.

Curvature of field becomes significantly pronounced here and reduce the sharpness towards the image borders. The same goes for large aperture lenses that suffer from increased spherical aberrations here.

Usually it's flat but especially some old bakelite cameras with just a simple meniscus lens have a curved image plane since the "curvature of field" of such lenses is stronger than that of more sophisticated multi-element lenses which deliver more ...

6, however in our flat-field chart tests the corners are rather soft, due at least in part to strong curvature of field. They progressively sharpen up on stopping down, but never match the centre.

The C-8 is diffraction and seeing-limited in the center, but curvature of field is serious in the corners of the D3. It should be much better on a DX camera like a D300. I need to try the 0.

Cropping Trimming unwanted parts of an image. Curvature of Field One of Seidel's five aberrations. A phenomenon in which light rays passing through a lens focus on a curved plane rather than a flat plane. Find out more.

that this plane is slightly concave, the more so in simple single element lenses and increasingly so with lenses of lower quality construction and materials. Compound lenses are built to correct this 'spherical aberration' or 'curvature of field'.

7 The 203mm is a 4-element/4-group Symmetrical design (good for closeups), the others are nominally "Tessar" types. Curvature of field seems to be the predominant lens abberation within the nominal image circle (corners improve with stopping down).

See also: Aberration, Image, Lens, Focus, Camera