therealthings wrote:
Well i have to admit that the 1dxII is not always on the money with it\'s AF.
Though i had set the wrong case here (1) and AF set to 9 group expansion.
www.serv.therealthings.com/pics/focus1.jpg
www.serv.therealthings.com/pics/focus2.jpg
In those 2 pictures, there is very little difference in contrast (or even color) between the bird and the background. When you are using multiple AF points, regardless of the camera or its AF system, it still has to \"guess\" as to what the subject is, and, frankly, in that situation, if it was able to get 10 out of 12 shots in focus, it would be, I think, reasonable to conclude that the camera\'s AF system did a great job.
If you were using a single AF point and if you could be absolutely certain that you were able to keep that single AF point on the bird (which is a very big if), you might expect the AF system never to miss focus. However, the more focus points you are using, the more you are increasing the chances that the camera\'s AF system is going to make an incorrect guess as to what the subject is, and that is especially true with a background like that in the 2 linked photos. So, it becomes a trade-off between the photographer\'s ability to keep a single focus point continuously on the subject or the camera\'s ability, with multiple focus points, to guess correctly what the intended subject is.
I don\'t dismiss the possibility that there is an AF issue with (some) 1DX Mark II bodies, but the example of those two photos being the only out-of-focus shots out of a 12 shot burst with that kind of background is not a convincing argument that there is an AF issue with the camera.
Jun 13, 2016 at 03:02 PM
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