how much improved for action shots with 79 AF points in A77 II vs 19 in A77
and 15 cross type AF points in A77 II vs 11 cross type AF points in A77.
do anybody have water sports or any fast action images from both to compare. preferably using 2.8 lens
thanks for reading
Lots better... its not just more AF points its a new focusing system with tracking Sony is putting in newer cameras they are calling it 4D focusing..
Sony recently updated the A77M2 page to link it to the 4D video that they released with the A5100 but A6000, A5100, A77 share the system.. with the only difference being the the A77 M2 has AF point set up using the SLT mirror for compatibility with all a-mount lenses.. where the e-mount wider coverage to sensor edge only works with defined Sony lenses the camera has info for (to deal with lens variations nearer the edge.
Marketing message>
http://www.sony.net/Products/di/en-us/products/g2sw/index.html
Be careful about getting hung up on single stats its about the system in focusing. In general I would not even worry about cross type AF spots for sports. They are nice but in reality they are there to give you better AF on vertical details like architecture that might be running up / down very parallel to the AF sensor orientation.. People, animals, landscape are not straight lines.. so in most cases will be fine with the vertically aligned sensors which catch horizontal details best. Cross type AF sensors are also a type of redundancy.. If you only have a dozen AF points having two in one location provides back up..
With the A77II there are so many AF points there is redundancy all over the place. And they cover a very large part of the frame.. compared to normal APS coverage.
Its how the Camera uses the sensors.. and part of what is going on is that Sony is using the main sensor to give smarts in selecting the AF points. Looking for shapes and colors the camera figures out which focus points belong to the object to be tracked.
In the A77s flexible spot system.. the camera will use groups of AF points to track an object.
There are two ways to select this tracked object. The camera can do it.. or you can use the center spot, press the joystick and the camera will then prioritize that object for tracking.
When I was shooting a kids cross country meet moving the camera up the line, if there was a kid with a t-shirt that was different like one red standing with larger groups of blue etc it would outline the kid head to toe (so it used the t-shirt to ID a unique object, but then realized the legs and head etc were also that kid. Even in packs of kids running it did a really good job of tracking a kid as they moved down the from the starting point.
Here are some of my cross country shots and here is a video of Photographer Gary Fong demonstrating some of the new focus capability
http://www.dpreview.com/forums/post/54469104
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K.E.H. >> Shooting between raindrops in WA<<
Don't Panic!.. these are just opinions... go take some pictures..