PHOTOGRAPHIC OBJECTIVE Russian patent published in 2002 - IPC

FIELD: optical engineering. SUBSTANCE: device has two parts. The first part is positive. It has three individual lenses the first of which is convexo-convex. The second lens is negative meniscus turned towards the image with its concave side. The third one is positive meniscus turned towards the image with its concave side. The second part is negative. It has for individual lenses of which the first and the second one are concavo-concave, the third one is convexo-convex and the fourth one is positive meniscus turned towards the object with its concave side. The lens has diffraction quality of image in spectral band width of Δλ ==500-900 nm and feature of apochromatic adjustment of the secondary spectrum. EFFECT: high resolution of images in wide spectral range. 1 dwg, 1 tbl