Photographic fisheye lenses with fixed focal length for cameras with different sensor formats have been well developed for decades. However, photographic fisheye lenses with variable focal length are rare on the market due in part to the greater design difficulty. This paper presents a large aperture zoom fisheye lens for DSLR cameras that produces both circular and diagonal fisheye imaging for 35-mm sensors and diagonal fisheye imaging for APS-C sensors. The history and optical characteristics of fisheye lenses are briefly reviewed. Then, a 9.2- to 16.1-mm F/2.8 to F/3.5 zoom fisheye lens design is presented, including the design approach and aberration control. Image quality and tolerance performance analysis for this lens are also presented. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
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机译：具有固定焦距的照相鱼眼镜头已经发展了数十年，用于不同传感器格式的相机。然而，由于较大的设计难度，具有可变焦距的照相鱼眼镜头在市场上很少见。本文介绍了一种用于DSLR相机的大光圈变焦鱼眼镜头，该镜头可为35毫米传感器产生圆形和对角鱼眼成像，并为APS-C传感器产生对角鱼眼成像。简要回顾了鱼眼镜头的历史和光学特性。然后，提出了9.2至16.1 mm F / 2.8至F / 3.5变焦鱼眼镜头设计，包括设计方法和像差控制。还介绍了该镜头的图像质量和公差性能分析。 （C）2017光电仪器工程师协会（SPIE）
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