The autofocus of the camera works by detecting the contrast in the image to be taken (passive autofocus) or send off a signal to estimate the subject distance (active autofocus). In some cases you'll find yourself struggling in taking photographs because the camera can't find a contrast or your subject is too close or too far (third party lenses) that your lens can't focus as well. The autofocus is also an essential part of photography, without it we are stuck with manual focusing and we can't capture the moment which only happens in matter of seconds thus leaving us also an out of focus images.
The number and types of autofocus may vary from entry, middle and high end DSLR models and lenses being used. There are two types of autofocus sensors; a cross type which has a higher accuracy due to the two dimensional contrast detection and vertical line type which has a lower accuracy due to one dimensional contrast detection.
Another factor which can affect the autofocus performance is the selection of AutoFocus Mode. Depending on what you are capturing there's also a corresponding mode. AF-C (Continuous) is used for moving subjects, AF-S (Single) is used for stationary subjects and AF-A (Automatic) which detect automatically either Continuous and Single will be used for a certain scenario. Manual Focus can be used also but not recommended for moving subjects.
Another settings you might consider is focus locks when the shutter-release button is halfway pressed and assist beam to illuminate the subject to detect your subject. You can read your camera manual for more information.
The number and types of autofocus may vary from entry, middle and high end DSLR models and lenses being used. There are two types of autofocus sensors; a cross type which has a higher accuracy due to the two dimensional contrast detection and vertical line type which has a lower accuracy due to one dimensional contrast detection.
Another factor which can affect the autofocus performance is the selection of AutoFocus Mode. Depending on what you are capturing there's also a corresponding mode. AF-C (Continuous) is used for moving subjects, AF-S (Single) is used for stationary subjects and AF-A (Automatic) which detect automatically either Continuous and Single will be used for a certain scenario. Manual Focus can be used also but not recommended for moving subjects.
Another settings you might consider is focus locks when the shutter-release button is halfway pressed and assist beam to illuminate the subject to detect your subject. You can read your camera manual for more information.
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