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 p.29 #1 · RG on 1D Mk IV autofocus performance | |
scowl wrote:
Yes but I don't think this is one of them. Point expansion is mainly a problem in backlit situations where the background has stronger contrast than your subjects, or where backgrounds have ideal AF targets that throw the focus off your subject. If your focus keeps getting stuck on things in the background, that's the time to switch expansion points off.
I hope you'll take this in a spirit different from a lot of the posts in this thread, which is to say I'm trying to be constructive and not contentious, but I disagree. I think it's a mistake, proven out to my satisfaction by my own experience, that in a crowded, somewhat distant soccer shot you are much better off sticking with a single selected focus point and that using the expanded assist points is problematic. I can only speculate that introducing that computational set into the camera's focusing analysis in this setting get the camera working against itself. That's not a flaw in my mind, it's the product of using a set up better used in different situations.
Canon, UK I think had for some time one a web tutorial of about 20 minutes with the MkIII discussing shooting soccer, and that Canon shooter made the same point.
I also think it's not helpful at least in soccer and like situations, to use expanded assist points and Main Focusing Point Priority, as RG did (it seems in all cases in his examples, but I certainly could have missed a change; I would think he'd keep it the same if he was trying the control the test). My experience is that it compounds the problem, and, my understanding at least, is that Canon's EOS custom guide explains the interaction in a way that supports my sense of it.
The C.Fn III-4 Tracking method function is always available when C.Fn III-8 AF point expansion is active. With this combination, the way the AF points show up, and the speed at which focusing occurs can change depending on the specific settings and is subject to the conditions at that time. When ‘Main Focusing Point Priority’ is selected and a new subject is detected, the AF point showing the fastest response is used first, even if it is not the manually selected focusing point. Focusing control reverts to the manually selected focusing point as soon as possible if the movement of the subject allows it....Show more →
So I think it's possible with the MkIV to set it to work for you, and to work against you, and I think RG's choices worked against him is some situations in his soccer shooting. No disrespect intended (think this conspiracy nonsense is a load of crap), can't put my record up against his, and different shooters can get to solid results by different means and work arounds. But I think his set up was not optimal for soccer. I would tend toward a single point and playing with the . I'll
Shot some more tonight for me to learn, youth futsal in a crappy light gym, all at 6400 and 12800, all at longer bursts than I would usually shoot, all a single point (mainly center) with tracking sensitivity in the middle. You could certainly hear the burst speed slow significantly when it was keeping focus on my son's plain green shirt. Going to review them soon and and will put some up in the "hands-on" thread, and maybe link a gallery of sequences in full res if that makes sense.
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, agree with you that what you suggest to do is not difficult but is what you are suggesting the correct approach, who knows?
