DSLR Camera Manual Settings।। Canon Nikon Autofocus, Continuous Shooting, Self-Timer, Photovision
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When you set your camera lens to AF (auto focus), digital SLR cameras offer the photographer a choice between interchangeable modes. Auto focus modes can vary between different digital camera brands. In the past, Nikon’s two most popular modes were called Continuous Servo AF and single area AF. Nowadays, they are called AF-C (short for auto focus continuous) and AF-S (short for auto focus single). Many Nikon models also have AF-Aand MF (manual focus) modes to choose from as well.
What are the differences between AF-C, AF-S, AF-A and MF focus options?
AF-C (AF continuous, sometimes called continuous servo) is good use when photographing moving objects. When your camera is set to AF-C and you focus on a moving subject, for example a dog running towards you, the focus will stay on the animal so long as your shutter button is held half way down. In other words, the camera will keep re-focusing as the animal moves. That is, so long as you keep your shutter button held half way down.
AF-S (AF single, sometimes called single area AF) mode, is good for photographing subjects that don’t move, such as flowers or portraits etc. It locks the focus on the non moving object that you want to photograph. You can then recompose the shot and take the photograph.
AF-A is where the camera selects and goes between the last two modes. If it thinks the subject you are photographing is stationary, then it will automatically use AF-S focus mode. If it picks up that the subject you’re photographing is a moving subject, then it will automatically use AF-C focus mode. This is also the default camera focus mode, unless you change the setting to AF-C or AF-S.
In this lesson you are going to learn how to use AF-C, AF-S and AF-A camera modes. All these focus settings are only available when the camera lens is in auto focus mode. Therefore, your first step is to look on the side of your lens and change the switch to AF or A (as its shown on some lenses).
How to change the focus mode between AF-C, AF-S and AF-A?
One-shot AF
Of the three AF modes offered on Canon DSLRs, One-shot AF mode is the most commonly used and many people regard it as the ‘standard’ autofocus option. When this mode is selected, the camera focuses the lens when the shutter release is pressed halfway down. Once focus is achieved, if the button is kept held down the lens will not adjust the focus even if the subject or the camera moves. If you want to refocus the lens you have to lift your finger from the shutter release and half-press again.
This is a useful autofocus mode for a wide range of photography including portrait, still-life, macro and landscape photography - anything with a motionless subject. It’s not usually a good choice, though, for sport and action when the subject is moving.
When you’re shooting in One-shot AF mode, the active AF point needs to overlie the subject in the frame in order for the camera to get it sharp. Canon DSLRs can select the correct point to use automatically or you can do the job yourself (see Focus Points for more on this). However, in some instances there may not be an autofocus point exactly where you need it and that’s where the ‘focus-and-recompose’ technique can come into play.
In some very low-light or low-contrast conditions, you may find that the camera is unable to focus on the subject and therefore the focus confirmation flashes in the viewfinder. If this happens, you should try to position the AF point over part of the subject that has greater contrast and give it another go using the focus-and-recompose technique if necessary.
AI Servo AF
This is the focus mode of choice for sports and action photographers because it sets the camera to continually check and adjust the focus while the shutter release button is pressed. It’s often used with Continuous shooting mode in order to take a sequence of images with the focus adjusting between shots as the subject moves towards or away from the camera.
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