Nikon d90 in the AF mode, the camera (the camera for 18-105mm g vr) … even for

lens manually labeled as the first ..need to state that:zoom and focus are two entirely different concepts .
in the following AF mode is you do not have to turn focus ring, auto-focus camera to focus on the way ..
you said that the “expansion” is a zoom that is ….Change the length of the focal length that is popular is the “narrow the gap between gap”, so that the product can understand it? Automatic retractable? You said it should be zoom?
Zoom lens when stretching, so that was Photo objects in your viewfinder which has been enlarged, the plan to transfer to your own, based on your own photographic needs of the composition (that is to say what you want to shoot), camera, you do not know what to make, of course, will not You have to do this.
Waiting for you in the viewfinder which will be taken to the object you want the size, usually in the viewfinder image is blurred, this time focusing on the needs and focus on the choice, according to the semi – Shutter, the camera will focus for you (if it is in support of AF, you set the course to support this feature), so that the inside of the viewfinder picture has become clearer.Focus, the camera is not in general There will be a significant expansion.
Focus is the focus of the two process.