Manual or Auto Focus on D90

[arkuro]

I am using a D90 currently and I seem to get the impression that autofocus on D90 is not good enough so sometimes I have to switch to manual focus. Also I am confused that if I choose the focus point in single point focus mode D90 will 100% focus on that point or the focus depends on some other factors. It will be greatful if somebody could answer this.

Thanks!!!

 

[greatest335i]

really i find the auto focus is pretty good on the D90

 

[Kofman13]

my d90 never fails to autofocus well. except in super low light, then i just focus on something relatively bright at the same distance

 

[KmH]

Also I am confused that if I choose the focus point in single point focus mode D90 will 100% focus on that point or the focus depends on some other factors. It will be greatful if somebody could answer this.

Thanks!!!

The center focus point is a cross-type focus point giving 2-dimensional contrast detection and is the most accurate focus point you have available. The other 10 focus points only give 1-dimensional contrast detection (vertical).

Focus accuracy is also affected by the lens aperture. Nikon states an auto focus threshold of f/5.6.

In low light, the D90 has an auto focus assist light that is enabled/disabled with a camera menu setting. Be sure and re-read your camera users manual.

For a general understanding of how contrast-detection auto focus systems work visit:
Understanding Camera Autofocus

 

[arkuro]

Thanks I will read it .. if i have any doubts i hope somebody will clear it .. thanks a lot to everybody