英语翻译HistoryBetween 1960 and 1973,Leitz (Leica)[1] patented an array of autofocus and corresponding sensor technologies.At Photokina 1976,Leica had presented a camera based on their previous development,named Correfot,and in 1978 they displaye

英语翻译HistoryBetween 1960 and 1973,Leitz (Leica)[1] patented an array of autofocus and corresponding sensor technologies.At Photokina 1976,Leica had presented a camera based on their previous development,named Correfot,and in 1978 they displaye
英语翻译
History
Between 1960 and 1973,Leitz (Leica)[1] patented an array of autofocus and corresponding sensor technologies.At Photokina 1976,Leica had presented a camera based on their previous development,named Correfot,and in 1978 they displayed an SLR camera with fully operational autofocus.The first mass-produced autofocus camera was the Konica C35 AF,a simple point and shoot model released in 1977.The Polaroid SX-70 was the first autofocus single-lens reflex camera,released in 1978.The Pentax ME-F,which used focus sensors in the camera body coupled with a motorized lens,became the first autofocus 35 mm SLR in 1981.In 1983 Nikon released the F3AF,their first autofocus camera,which was based on a similar concept to the ME-F.The Minolta Maxxum 7000,released in 1985,was the first SLR with an integrated autofocus system,meaning both the AF sensors and the drive motor were housed in the camera body,as well as an integrated film advance winder - which was to become the standard configuration for SLR cameras from this manufacturer,as it would for Nikon.Canon,however,elected to develop their EOS system with motorised lenses instead.More recently,Nikon have also adopted this strategy with their AF-S range of lenses; their entry-level DSLRs do not have a focus motor in the body.
Active autofocus
Active AF systems measure distance to the subject independently of the optical system,and subsequently adjust the optical system for correct focus.
There are various ways to measure distance,including ultrasonic sound waves and infrared light.In the first case,sound waves are emitted from the camera,and by measuring the delay in their reflection,distance to the subject is calculated.Polaroid cameras including the Spectra and SX-70 were known for successfully applying this system.In the latter case,infrared light is usually used to triangulate the distance to the subject.Compact cameras including the Nikon 35TiQD and 28TiQD,the Canon AF35M,and the Contax T2 and T3,as well as early video cameras,used this system.
An exception to the two-step approach is the mechanical autofocus provided in some enlargers,which adjust the lens directly.

英语翻译HistoryBetween 1960 and 1973,Leitz (Leica)[1] patented an array of autofocus and corresponding sensor technologies.At Photokina 1976,Leica had presented a camera based on their previous development,named Correfot,and in 1978 they displaye
历史
1960年至1973年,徕兹（徕卡） [ 1 ]专利阵列和相应的自动传感技术.举行的Photokina 1976年,徕卡相机提出了一个他们以前的基础上发展,命名Correfot ,并于1978年,他们表现出的单镜反光相机的全面运作的自动对焦.第一次大规模生产的自动对焦相机柯尼卡C35自动对焦,一个简单的拍摄模式,并在1977年公布.宝丽希凯SX - 70是第一个自动对焦单镜头反光照相机,于1978年公布.宾得我,男,该传感器用于集中在机身加上机动镜头,成为第一个自动对焦35毫米单镜反光相机于1981年.在1983年尼康发布了F3AF ,他们第一次自动对焦相机,这是基于一个类似的概念在我氟.在美能达兼容Maxxum 7000 ,发布于1985年,是第一个单镜反光相机的综合自动对焦系统,这意味着双方的自动对焦传感器和驱动马达被安置在了机身,以及一个综合卷片机-这是成为标准配置为单镜反光相机从这个制造商,因为它将为尼康.佳能,然而,当选为发展自己的EOS系统的机动镜片代替.最近,尼康也通过这一战略的镜头AF - S系列镜头,其入门级的数码相机没有重点电机在体内.
积极自动
主动测量距离自动对焦系统的主题独立的光学系统,并随后调整光学系统的正确的焦点.
有各种不同的方法来测量距离,包括超声波声波和红外光.在第一种情况下,发出的声波的摄像头,通过测量其反射延迟,距离计算的主题.宝丽来相机包括光谱和SX - 70被称为成功应用此系统.在后一种情况下,红外光,通常采用三角距离的主题.紧凑型数码相机,包括尼康35TiQD和28TiQD ,佳能AF35M ,和康T2和的T3 ,以及早期摄像机,使用这一系统.
一个例外,这两个步骤的办法是机械自动提供一些enlargers ,它直接调整镜头.11111111好幸苦啊 有一些由于是专业词所以有用软件查啦下