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5 Possible Reasons Your Camera’s Auto Focus isn’t Functioning Well

Posted by oneslidephotogaraphy On August - 28 - 2017

How to avoid misfocus

How to avoid misfocus

Even though autofocus is a default feature in digital cameras, there are still times when you feel like it’s quite a challenge to get the accurate focus point or your lens takes quite a while to lock onto a focus point. Don’t worry just yet, this is quite the normal and not always due to a malfunction in your camera.

Usually, autofocus has difficulty focusing or is slow in finding a focus point because of one of the following:

1. The focus switch is still at MF (Manual Focus). Toggle your focus switch to the AF, A, or A/M setting. In Canon cameras, the switch is located only on the lens; but there are some Nikon cameras that have the focus switch on the camera body.

AF-switch

AF-switch



2. The distance between the camera and the object it’s trying to focus on is too close. Lenses have a minimum focal length, and they vary between different types of lenses. For example, if the minimum focal length of the lens is 30 cm and the distance between the lens and the object is 20 cm, then the lens can’t focus. The only solution here is to find out the minimum focal length of your lens and set the distance accordingly. This focal length can be seen on the lens on the focus distance window; usually in units of meter or feet.

3. You may have chosen the wrong focus area point. There are usually many focus points on a camera digital or a DSLR. These focus points can be set automatically or manually. Say a camera has 7 focus points; if you set the mode to Auto, then all 7 focus points will be active and will focus the image on the focus point nearest to an object. If you set the focus points to Manual, the lens will focus on objects within the focus areas that you’ve determined.

AF-area

AF-area



4. The object you’re trying to focus on may not be contrast enough with its background, or it may not have a distinct shape. This usually occurs when photographing walls, cloudless sky, or foggy areas. As a solution, lock the focus point on contrast areas of the frame, such as the edge of the borders of the object and then compose your framing before taking the shot.

5. The object you’re trying to focus on may be too dark or you’re in a low-light environment. With a lack of light, the camera and lens will have a difficult time determining a focus point. To cope with this, several cameras are equipped with an AF Assist feature to ease the search of a focus point. There’s also an option to use the AF Assist that exist in external flash. If your camera doesn’t have this feature and you don’t have an external flash, you can also try using a flashlight to illuminate the focus area.

AF-Assist

AF-Assist



If you’ve tried all the points above and still fail to focus correctly, you can always fall back on the manual focus setting. For the highest probability of accuracy when using manual focus, activate your camera’s Live View, zoom into the object you’d like to set your focus on, and rotate the focus ring until the object appears sharp on the screen.
S p o n s o r e d L i n k s





One Response to “5 Possible Reasons Your Camera’s Auto Focus isn’t Functioning Well”

  1. Donald Janelle says:

    I read your posts all the time. They are very informative and interesting. Thank you. That said, there is one pet peeve that shows up every now and then (on this page and others). That is the suggestion of turning off the focus beep. While for the vast majority of your readers this may be a good and valid point. For us older readers, whose eyesight might not be as sharp as it once was, that noisy focus beep is invaluable. (I do have the audio set as low as possible, but it IS on).

    The thrust of my comment is to remind your writers to acknowledge the need to silence the beep as often as possible, and yet acknowledge the real need for the beep for people with failing eyesight.

    Thank you

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