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An auxiliary focusing method for ultra-long focal lens

A focusing method and ultra-long technology, applied in the field of auxiliary focusing of ultra-telephoto lenses, can solve the problems of slow focusing speed and low focusing accuracy, and achieve the effects of fast focusing speed, high focusing success rate, and improved lifespan

Inactive Publication Date: 2018-12-14
GOSUNCN TECH GRP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an auxiliary focusing method for super telephoto lenses to solve the problems of slow focusing speed and low focusing accuracy in the existing focusing methods. The focusing method provided by the present invention can effectively improve the service life of the lens

Method used

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  • An auxiliary focusing method for ultra-long focal lens
  • An auxiliary focusing method for ultra-long focal lens

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0030] This solution provides an auxiliary focusing method for a super telephoto lens. Mainly through an automatic ranging device to obtain the distance from the camera to the target point, and then test the focal length (foucs) under different object distances (distance) and different magnifications (zoom) through experiments, and then fit the correlation calculation formula algorithm. In this way, according to the relevant calculation formula, the foucs value can be obtained under the known diatance and zoom values, so that the focusing lens can be quickly pulled to the corresponding position, and the accuracy is also guaranteed. The specific method is as follows:

[0031] 1. Acquisition of experimental data: firstly, the relevant ranging sensor can be installed side by side with the lens to keep the target of th...

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Abstract

The invention belongs to the technical field of camera focusing. The auxiliary focusing method of ultra-long focal lens is mainly to obtain the distance between the camera and the target point by an automatic ranging device, and then to test the focal length foucs under different distances and zooms through experiments, and then to fit the relevant calculation formula algorithm. In this way, the foucs value can be obtained according to the formula of diatance and zoom, so that the focusing lens can be quickly pulled to the corresponding position, and the accuracy is guaranteed. The scheme caneffectively solve the related problems caused by the large focal length range of the ultra-long focal lens. Focusing speed is fast, accurate and the success rate of focusing is high. The method effectively reduces the loss of focus motor, improve the lens life.

Description

technical field [0001] The invention relates to the technical field of camera focusing, in particular to an auxiliary focusing method for a super telephoto lens. Background technique [0002] During the image acquisition process, whether the auto-focus lens can automatically focus to obtain a clear image is the first step in image analysis and processing, followed by whether the electric lens actuator can quickly move to the corresponding zoom position. The traditional manual focusing method mainly relies on human visual inspection and manual adjustment, which is not only cumbersome and time-consuming, but also the adjustment length is greatly affected by human subjectivity. Therefore, auto focus lens is more and more subject to people's favor. [0003] At present, the focusing method of ultra-telephoto lenses (focal length > 500mm) mainly adopts the method of first pulling up the lens through the motor within the focus range of the lens, and searching for the clearest p...

Claims

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Application Information

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IPC IPC(8): H04N5/232H04N5/225
CPCH04N23/55H04N23/67
Inventor 方锐涌张腾腾黄仝宇汪刚宋一兵侯玉清刘双广
Owner GOSUNCN TECH GRP