Ultra-wide field optical system
An optical system and ultra-wide-angle technology, applied in the field of optical lenses, can solve the problems of inability to monitor the scene, large rotation range, and insufficient monitoring, etc., and achieve the effects of reducing structural tolerance sensitivity, reducing height, and improving sharpness
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[0025] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0026] An ultra-wide-angle optical system of the present invention, such as figure 1 and figure 2 As shown, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a filter 6 and a photosensitive sheet 7 are arranged in sequence from the object side 9 to the image plane, and the second An aperture 8 is provided between the lens 2 and the third lens 3 .
[0027] The first lens 1, the second lens 2 and the fourth lens 4 are negative focal length lenses, and the third lens 3 and the fifth lens 5 are positive focal length lenses;
[0028] The side of the first lens 1 facing the object side 9 and the side facing the image surface are both spherical;
[0029] The side of the second lens 2 facing the object side 9 and the side facing the image surface are oblate aspheric surfaces;
[0030] The third lens 3 and the fourth lens 4 ...
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