Originally posted by GLXLR What is the big deal about auto-focus points? Isn't 11 points or 9 enough for any type of situation? Could someone explain why anyone would spend extra $$$ on 51 autofocus points when they could just learn how to accurately MF?
Albert gave a very ghood explanation as to why you have so many AF points in some cameras.
Now from the number you seem to be talking about the last nikon AF module and having spend about 18 months with it, I guess I do have some experience, however going over it all is a lot more complex than it sound, as the various AF modes and selectable options makes the caemra reach slightly different.
First of whether you use center only, selectable or "auto select" af point affects how the AF the intial focus acquisition is made.
meaning either it is the center point, one of the 51 points as selected by the user or one of the 51 points selected by the AF module, this affects the 4 main tracking modes on the camera.
1) 9 point tracking (the point of initial focus lock supported by the surrounding AF point)
2) 21 point tracking (as above, but supported by two circles of AF points)
3) 51 point tracking (as above but supported by all the AF points)
4) 51 point 3D tracking ( uses a colour information and some other stuff to determine what you orginially locked on to and use that information to track you original focus point across all of the AF points)
Furthermore you have four different lock on values going from off to long for each of the tracking modes.
Now all this together adds for a very configurable package that takes quite a while to learn how operates and how to tailor to your shooting needs.
IT is far more advanced than what I have seen from my pentax bodies so far, but also far easier to set up "wrong" for what one are about to shoot.
So if you are confident and can operate your camera like second nature, then it is a highly impressive system, but you need to know exactly what you have asked the camera to do or else you may be in for a surprise and a missed shot.
Originally posted by 5teve so as a side question...
what do people use? multi point, selectable, or centre?
i use centre as its what im used to.. but... if more people use multi for a reason.. i may well give it a try... just not sure i trust the camera to choose what i'm focusing on
Thanks
Steve
I use selectable or centre point depending on what I am shooting, center point with AF-C and 3D tracking gives focus and recompose a whole new meaning on the new nikons, quite a useful thing.
But on my K-m it is centre point only on my DS it is selectable and it will be selectable once my K-7 arrives.