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８０年代中期国外各著名照相机生产厂家先后推出了３５毫米自动对焦（ＡＦ）单镜头反光照相机。此后围绕３５毫米自动对焦（ＡＦ）单反照相机在世界摄影器材市场展开了一轮又一轮的角逐，使自动对焦（ＡＦ）单反照相机达到了尽善尽美的程度。现在欧美发达国家这种自动对焦...
The mid-80s all well-known foreign camera manufacturers have introduced a 35 mm AF (AF) single-lens reflex camera. Since then, 35mm AF (AF) SLR camera in the world of photographic equipment market has launched a round after round of competition, the AF (AF) SLR camera to achieve the perfect degree. Now developed countries in Europe and the United States this AF ...