In both cases, you need to calibrate (or micro-adjust) your camera and lens. This can also result in misinterpretation by the focusing sensor.
It will be blurred where it should be sharp.Īlso, some parts in your lens may not be exactly aligned with the required factory standard. Your final photo will show a shift in focus. In this case, something in focus on the autofocus (AF) sensor will not be focused on the imaging sensor. The problem arises when the two sensors are misaligned. This process doesn’t check if the resulting shift places the subject in focus. And all light hits the primary (imaging) sensor. When you take a picture, the mirrors rise. It uses a technology called phase detection. The secondary sensor interprets the light and instructs the lens to focus in a certain way. Press the shutter button halfway to autofocus. And the rest travels up through the viewfinder to your eye. A part of the incoming light hits the secondary sensor. There are also mirrors that direct the light either to our eye or to the imaging sensor.
In a DSLR, there are (at least) two separate sensors-one for imaging and a secondary one for autofocusing. The first thing you need to understand is how autofocusing works in DSLRs. Buy from Unavailable Why Do You Need Lens Calibration?
