Correct focusing techniques or getting the right focus are often the most underprivileged among the things we need to be aware of when taking pictures. Whether Compact camera users or DSLR camera users, they often do not interfere with focus adjustment, leaving the control to the camera in fully automatic mode. If the subject we are trying to capture in the photographs we take is blurry and other different parts of the photograph come out clearly, you will have to take the strings and read the article carefully.The more important the correct exposure is for the photo shoot, the more important the correct focus should be.
Autofocus (AF) Modes
All today’s digital cameras can do the auto focus for you at the press of a button. Lenses with quality AF system bring the focus to the right position much faster than the human hand and eye, that is, they can focus correctly. Thanks to these features, AF (Auto Focus) systems become a useful feature especially for those who take documentary, sports, fashion photographs and those who do not see well. Most DSLR models today have 2 main AF modes, “single-servo” and “continuous-servo”.
Single-servo: It is the AF mode used for shooting scenes such as scenery and portrait when the subject is not moving. After you press the shutter button halfway down and focus, your camera will signal the focus with video or sound and the shutter button is fully pressed and the picture is taken. This mode is also called “focus priority” mode because we cannot take a picture without the focus complete signal.
Continuous-servo: Developed to track and shoot moving objects. Focusing with the shutter button pressed halfway with the single servo is continuously renewed without the shutter button fully pressed. In this mode, it is necessary to keep the subject in the selected focus points (if all focal points on the camera are active, they all work in tracking). In this mode, unlike Single-servo, it can be shot at any time and therefore the mode is known as ‘release priority’ mode. One of the features that make professional DSLR cameras superior is that their continuous-servo modes are more stable and faster than other models.
Variable AF: It is the AF mode that switches between continuous-servo and single-servo according to the position. The machine focuses primarily in single-servo mode and if the focused object moves, the system switches to continuous-servo.
Always getting the focus on the subject where it should be, requires involvement in focusing the shot, except in point-and-shoot camera mode. The reason is that the speed and sensitivity of the AF system can vary greatly from situation to situation and from camera to camera. Since AF systems have a margin of error like any electronic / mechanical system, we may need to understand the operation of the system and intervene in cases where it fails. Apart from AF mode, another important issue when focusing is how to use the focus points. Each model of DSLR camera has at least one or more of this focusing point, and some or all of them can be assigned to the focusing task, depending on the structure of the system. What is important for us here is to choose one or the other of these focal points and say to the machine that you focus on this point or points, if we have chosen a single point, mixing the other points.