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Relevant for: ImageMaster®
Field curvature is an optical aberration in which the focus position changes from the center to the edge of the field of view. The curvature of the image field is a lens aberration that causes a flat object surface to be imaged onto a curved surface rather than a plane. Field curvature varies with the square of field angle or the square of image height.
In the presence of the astigmatism, there are two separate astigmatic focal surfaces in orthogonal directions.
To determine the field curvature a set of through focus measurements at different positions in the field are taken. The MTF maxima and the corresponding positions in field are determined. The values are collected by a software routine and displayed in graphical and tabular form.
Relevant for: ImageMaster® |
KnowledgeBase > Field Curvature 
