{"id":8427,"date":"2015-11-25T12:00:00","date_gmt":"2015-11-25T12:00:00","guid":{"rendered":"http:\/\/dev.wordpress\/?p=8427"},"modified":"2018-05-07T06:54:34","modified_gmt":"2018-05-07T10:54:34","slug":"closer-look-4d-focus-technology-behind-sonys-new-a68-dslr","status":"publish","type":"post","link":"https:\/\/www.adorama.com\/alc\/closer-look-4d-focus-technology-behind-sonys-new-a68-dslr\/","title":{"rendered":"Closer Look: \u20184D focus\u2019 Technology Behind Sony\u2019s New a68 DSLR"},"content":{"rendered":"

Sony recently announced that it would release the Alpha a68, its latest entry-level DSLR, in March 2016. While much of its specs don\u2019t differ radically from the entry level cameras offered by Canon and Nikon, it features a new \u201c4D Focus\u201d system that promises to be one of the fastest, most intuitive auto-focus systems on the market. <\/span><\/span><\/p>\n

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4D Focus sounds abstract, but the theory behind it is actually pretty simple. There are three factors (or three dimensions) normal AF take into account: space, depth and area. These are concerned with how far away the object is, its parameters and the noise surrounding it. Sony\u2019s 4D Focus system adds a fourth dimension to the equation: time. <\/span><\/span><\/p>\n

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This means that its AF system won\u2019t just focus on where the object is, but where the object is going. It does this by tracking the speed and predicted movement of the object, so it can track the object even as it comes in contact and moves behind other objects in the camera\u2019s field of view. <\/span><\/span><\/p>\n

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That\u2019s just one of the reasons the \u201c4D focus\u201d is receiving high praise. Focusing in just 0.06 seconds, it also claims to be the world\u2019s fastest autofocus system. <\/span><\/span><\/p>\n

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Plus, its AF system casts a much wider net, in a manner of speaking, than the competition. Most DSLRs have just a dozen or so focus points near the middle of the frame that find and focus on the object. The a68 will have 79 focal points and 15 cross points, meaning that it can instantly focus on an object no matter if it\u2019s in the center of the screen or in the far corner of it. Sony\u2019s \u201cTranslucent Mirror Technology\u201d will allow the a68 to deliver up to 8fps continuous shooting with its constant autofocus tracking. <\/span><\/span><\/p>\n

Here\u2019s a video showcasing the system\u2019s abilities: <\/span><\/span><\/p>\n

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