Originally posted by WMBP snip
Selective focus is achieved by using the AF point switching dial that encircles the four-way controller. Turn the AF point switching dial to SEL, and you're using selective focus, whether you use the center point or one of the other ten points.
But I asked you, if you ONLY AND ALWAYS use the center point in SEL focus, then what is the difference between using selective focus and using center-spot focus -- one of the other three auto-focus options? I don't think you answered this question.
Will
Now that we know what you really mean when using the term selective focus here is your answer.
I do not use selective focus as you have defined it - nor do I let the camera pick which focus point is used. I use the center focus point exclusively - that's just what I do and your mileage will vary.
The difference is that I can rapidly decide object is to be in focus - set that object to the center of the frame - push the AF button (remember the shutter button does not activate AF on my cameras - it is de-coupled). I can then point the camera at the object that I want to meter off of (if using spot metering) - hit the ael button - then ------ compose ------ and press the shutter button. If I release the shutter button - to modify the exposure or recompose - the focus does not change - I do not have to let the camera hunt - or move the focus point with the 4-way switch to get the "point" in use on the subject again.
Your technique and workflow will be different than mine - but I just use the center because I have 30+ years of experience doing it and while I have tried other methods I find them limiting. To answer directly - selective focus, as you defined it, is a waste on my machines.
OT a little: Now just be glad that you are not using the N*kon D3 - with 51 focus points, ironically all more or less concentrated around the center of the frame. Just how many wheels would you need to use that? How many shots have you lost - while trying to choose what focus point is best?
The Elitist - Formerly known as PDL