Also, make sure you’ve selected the best autofocus area for your subject. So make sure you understand when to use each type of your focusing modes and focusing points and areas. If you are not familiar with and understand the different types of focusing modes, you will easily get out-of-focus photos. Use a bulb blower to shot some air into your AF sensor.The same way as you do when cleaning your camera sensor. From your camera menu, choose “Lock mirror for cleaning”.To clean your AF focus, follow the steps below: Sometimes the autofocus sensor is dirty, which, of course, leads to consistent focusing problems. Use a bulb blower to remove dust, then use a swab and isopropyl alcohol or cleaning solution. The process of cleaning these contacts is easy. When the contacts get dirty, it can interfere with the focus system and create an error message. The lenses are provided with metal contacts that connect with similar contacts in the camera body to establish the communications ways between the lens and the camera. For more detailed information, you may check my post “ How To Calibrate Your Lens- Enhance Autofocus Accuracy” and “ How To Use Sigma USB Dock- Calibrate And Customize Your Sigma Lens” This might mean that your camera and certain lenses aren’t playing together nicely and it is time for a tune-up or a calibration. The small switch on your lens lets you toggle between the two but often it’s easy to forget to switch back to autofocus.Īfter using your camera for sometimes or you just buy a new lens, you may find that your camera’s autofocus is not working well and you get blurry photos for no apparent reason. The most obvious and often overlooked cause is forgetting switching your lens to autofocus mode. The AF-Area Mode”, which allows photographers to choose several options to use while operating in Single Area/Continuous modes.Ĭommon autofocus problems and how to fix them The focus modes are summarized in the following table: Modern DSLR cameras have a built-in system to handle such situations. However, if you have a subject that is continuously moving, you need your camera to readjust focus automatically as you take pictures. If the subject moves, you reacquire focus again and take another picture. When photographing still subjects, you generally acquire focus once and take a picture. When a lens starts to “hunt” for focus, it simply means that a camera cannot find enough contrast and sharpness to be able to acquire focus. If it is blurry, the AF system will adjust the lens focus until sharpness/contrast is achieved. The term “detect contrast” means that the AF system tries to look for sharpness in a particular part of an image. Contrast Detection, It uses the camera sensor itself to detect contrast in the image.Phase Detection, It uses special sensors within the camera to detect contrast from the light that goes through the lens.The Passive AF system works in two different ways: The cons of Active AF is that it can be used only for stationary subjects and it only works for close subjects within 15-20 feet. The pros of active AF is that it can be used in very poorly lit environments, where normal (passive) AF does not function.
Once the camera knows what that distance is, it instructs the lens to adjust focus based on this information. The Active AF system works by shooting a red beam on your subject, then bouncing that light back to your camera to figure out the distance between the camera and the subject. There are two types of AF (Autofocus) systems: Active and Passive. Summary of the autofocus system Autofocusing types I highly recommend that site in buying/selling used camera gear. Let us begin by summarizing the types of autofocus systems and their modes. I do believe that knowing your autofocus system well, and how it actually works will help you a lot in solving most of your autofocus problems. In this post, I’ve gathered some possible causes for having focusing problems with your camera and lenses. It can pick up the wrong thing or fail to find anything to focus on and you get blurry photos. When your DSLR lens would not focus properly, and instead, it would constantly move in and out (hunting for focus), not stopping to focus on any particular object.
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