PROJEKTIONSOBJEKTIV

The total angular aperture is no less than 12.8 degrees . Spacing of the entrance pupil from the object plane on the illumination side, is 100-400 mm. Edge field inclination of the outward beam, relative to the optical axis in the object space between object and a lens surface of the objective, is no less than 1 degrees . Corresponding inward inclination (close to the optical axis) of the beam in the same object space, is no greater than -14 degrees . Both angles are positive when the beams intersect the axis at one location seen away from the object in the direction opposite to projection. They are negative in the other direction. The element sequence follows, considered from the object- to the illumination side: (a) Negative meniscus elements (1,2) with convex sides facing the image; (b) Positive element (3) with convex side facing the object; (c) Positive meniscus (4) with convex side facing the image; (d) Negative element (5) with concave side facing the object; (e) Biconvex lenses (6, 7); (f) Positive element (8) with convex surface facing the object; (g) Positive element (9) with convex surface facing the image.