don't shoot a moving object in AF-s ..I got that
You shoot catwalk in AF-C similar to aisle ..yes got that
So how do you switch fast from S to C and back to S.....that is the question....
?
Let me reformulate it, as you obviously are missing the point
To begin
AF-S means (and I quote the Nikon/ Imaging Products site)
In single-servo AF (AF-S), focus will lock if the shutter-release button is kept pressed halfway after the camera focuses.....
Focus lock is used to change the composition without changing focus. If you frame the shot so that the main subject is in the selected focus point, focus, and then change the composition while keeping the shutter-release button pressed halfway to lock focus, you can create compositions in which the main subject is not in a focus point but is nevertheless in focus.So when you use it on a moving subject, it will, when you half depress the shutter release, focus on the subject when it's in a certain spot, and have/keep the focus there (even if the subject has moved from that spot, and thus will risk to result in a out of focus picture) until either you take the picture, or take your finger from the release button, and refocus by half depressing it again.
Which for all practical purposes makes it the wrong choice for shooting moving subjects like brides walking down the aisle (or models down the catwalk)
I can imagine (although I never used it that way) that while using AF-C (where, again quoting Nikon/Imaging Products, 'the camera will continue to focus if the shutter-release button is kept pressed halfway after the camera focuses') you might want the focus on a different spot where the camera has it at that moment.
Again, for the reason mentioned earlier, very unpractical when your subject is moving, but perhaps an option one might want to use when the subject stops for a brief moment/spit second, and you want to 'fine tune' the focus for a specific spot (other then where the camera, based on the focus spot used, has it).
As changing the AF settings from AF-C to AF-S, is, as observed by the OP and others, too slow and cumbersome (and as all agree upon impossible to do so swiftly), rather then breaking one's brains over how to make that change fast nevertheless, in my opinion/'laboratory conditions' experience maybe better use the M/A focus settings on the (AFS) lens,while the camera is in AF-C mode.
The camera will, based om the AF focus point, focus on a certain spot within the composition.
But in that split moment the subject is standing still and when you want to focus spot on a different point in the composition (and where AF-S, and focus/recompose would seem the best option) rather use the focus ring on the lens to override the spot where the camera's AF (in AF-C mode) has locked in and adjust it manually to where you prefer it.
For all practice and purposes as slow as focus/recompose, (but that would not be a problem since the subject is standing still), but it will allow to get the focus on a certain, other then the camera has it in that composition, spot, without the hassle of changing from AF-C to AF-S.
It, I think, would/will mean having to have some skill with focusing very fast manually, and a quick eye/hand reaction to actually, in the split moment the subject is standing still, take the picture when the focus is on the desired spot.
And admittedly isn't as easy as using AF-S in focus priority (and just having the camera taking the picture when it thinks the picture is in focus, even if the subject may no longer be there).
Yes, not the 'answer' on 'how to how do you switch fast from S to C and back to S' , but from a practical point of view perhaps a viable option
