For fast-action autofocus, the new state-of-the-art technology is only available on the new Sony a77 - Mk 2. This new technology automatically 'tracks' the focus and exposure of a rapidly moving subject while the photographer either depresses the shutter halfway or is firing a multi frame sequence. The Sony a77 MkII not only has a 12fps high speed mode, this mode actually nails focus for a remarkably high success ratio.

SONY CAMERA COURSES
Sony a6400 Course: http://bit.ly/2TWI7TE
Sony a7iii Course: http://bit.ly/2TYyFiG
Sony a7Riii Course: http://bit.ly/2TUqNhW
Sony a9 Course: http://bit.ly/2TYyIuS
Sony a6500 Course: http://bit.ly/2ThAOWf
Sony a6300 Course: http://bit.ly/2TXKvcA
Sony a7Rii Course: http://bit.ly/2TY9KLR
Sony a7Sii Course: http://bit.ly/2U332Vf
Sony a6000 Course: http://bit.ly/2TY8Yyz
Sony a7ii Course: http://bit.ly/2TWHOIu
Sony RX10ii Course: http://bit.ly/2U4JU8Y
Sony RX100iv Course: http://bit.ly/2TTcNVS
Sony a7 Course: http://bit.ly/2U4K4gA
Sony a7S Course: http://bit.ly/2TWvoQP
Sony a7R Course: http://bit.ly/2TTkwTz
Sony a77 Course: http://bit.ly/2TZzIyI
Sony a77ii Course: http://bit.ly/2TWOTZz
Sony a99ii Course: http://bit.ly/2TYGuVk
Sony a99 Course: http://bit.ly/2TWXThp

EDUCATIONAL COURSES
Sony Mirrorless Cinema Series: http://bit.ly/2TX0UOJ
How To Shoot A Wedding: http://bit.ly/2TYxSye
An In-Depth Discussion About sRgb and AdobeRGB: http://bit.ly/2TTkFX7
How To Setup Your Sony Wireless Flash: http://bit.ly/2TVO96N