This paper designed a large fisheye conversion lens work for digital projector, the lens work in many applications where users simply want to project a very wide angle onto the screen, such as simulation, immersive environments, and amusement parks. This lens can be applied to most of the current commercial projectors, and the projection ratio of the current commercial projector can reach 0.6 to 0.8: 1, the optical aperture is larger than the diameter of 220mm.
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