Objective has a focal length to apparatus for photographic views

• 1. 变形物镜系统和形成具有不同焦距的变形物镜组件的方法 [P] . 中国专利： CN111562632A . 2020-08-21
• 2. 具有可调节的焦距的手术显微镜‑物镜 [P] . 中国专利： CN103592751B . 2017.04.12
• 3. View finder for photographic apparatus utilizing objectives having different focal lengths [P] . 美国专利： US4038673A . 1977-07-26

  机译： 利用具有不同焦距的物镜的照相设备的取景器

• 4. The corrective devices in order to obtain a proper coupling of two objectives, removable or not, and different focal lengths, on a photographic apparatus of the reflex to two objectives [P] . 法国专利： FR1037846A . 1953-09-23

  机译： 为了在“反射”的照相设备上获得正确的两个物镜的校正装置，以使两个物镜（可移动或不可移动）以及不同的焦距正确耦合。

• 5. Optical accessory for photographic projectors - combines advantages of small viewer with those of projector having long focal length objective [P] . 瑞士专利： CH580287A5 . 1976-09-30

  机译： 用于照相投影仪的光学配件-结合了小型观察者和具有长焦距物镜的投影仪的优点

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• 2. 1996 The First KONGYUYAN JIU CUP China Traditional Opera International Photographic Competition Collecting Photographic Works Information [J] . 中外文化交流：英文版 . 1996,第002期
• 3. Analysis of difference in orientations and focal lengths of two arbitrary perspective viewing Cameras [C] . Aishwarya Ramachandran, R. Balasubramanian, K. Swaminathan, Vision Geometry XV; Proceedings of SPIE-The International Society for Optical Engineering; vol.6499; Electronic Imaging Science and Technology . 2007
• 4. Polymer-based wide-angle micro-optic lens system with dynamically variable focal length and field of view. [D] . Agarwal, Mangilal. 2004
• 5. Standardized Photographic Views in Oculoplastic Surgery: How to Capture Quality Images Outside a Photographic Studio [O] . Chin T Ong, George Kalantzis, Jun Fai Yap, -1
• 6. Effect of object frequency on focal position of four photographic objectives [O] . Fred W. Rosberry 1956

• 1. Characterization of Reinforced Carbon Composites with Full Field Measurements: Long Gauge Length Compressive Apparatus [J] . Mathieu Colin de Verdiere ,Alexandros A. Skordos ,Andrew Walton . 复合材料期刊（英文） . 2013,第1期
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• 3. Multi-objective Optimization Conceptual Design of Product Structure Based on Variable Length Gene Expression [J] . WEI Xiaopeng ,ZHAO Tingting ,JU Zhenhe . 中国机械工程学报 . 2011,第001期
• 4. 宽光谱、长焦距准直物镜光学设计 [C] . 黄雷 ,胡雯雯 ,杨志文 . 2007年光电探测与制导技术的发展与应用研讨会 . 2007
• 5. 变焦距电视摄像物镜设计 [A] . 单娟 . 2014