How do camera body motors compare to in-lens motors for focusing?
I am planning to buy a Nikon D5100 camera. However, when I compare it with the Nikon D90, one difference I see is that the Nikon D90 has a in body integral AF motor while the D5100 lacks this and has to use the motor in the lens ? What are the main advantages/disadvantages of having an in body focus motor ? Does this really matter much in the quality of the photos to be clicked ?