Originally posted by acarpov Marc thank you i got all you points, but the first one. What do you mean by not telling the camera where to focus?
I mean, the camera has a certain number (depends on the model) of focus points - places in the viewfinder where it can focus. The default mode of the camera is for it to choose which of them to use, meaning it might choose something on the left side of the picture where you wanted it to focus on something on the right side. You should be using one of the modes where choose which focus point the camera uses.
Quote: So i only use manual mode (with autofocus) can it actually be the case that because i adjust apertures and shutter speeds manually, autofocus works slower than when i use shutter priority or aperture priority?
No.
Quote: Is manual focusing better?
Well, then you *definitely* only have yourself to blame if focus is not where you want it.
Quote: What do you guys use in say taking photographs of people ?
Sometimes I use AF - telling the camera to use the center focus point - but since the actual sensor is much larger than the red square, there is no guarantee the camera will actually focus on the person and not something else that happens to be "near" the person as it appears in the viewfinder. So if there is something else in range of the sensor and I can see in the viewfinder that the camera keeps choosing it, I'll just take over (via quick shift) and focus manually. Of course, most of my lenses are manual focus only anyhow, so with them I'm definitely using manual focus.