![]() What about AutoFocus-Lock (AF-L)? Similar to exposure lock, autofocus lock can be used to stop the camera from making the lens reacquire focus when you recompose. Basically, any time consistency of exposure is required and you do not want to switch to a full manual mode, the AE-L button can be very useful. Another good example is if you are photographing a subject with a constantly changing background and you want to expose the subject exactly the same way from shot to shot. If one exposure differs from another, it is practically impossible for panoramic software to stitch images together in a consistent, continuous form. It is extremely important to use exactly the same exposure from frame to frame in panoramic photography. One example is when you photograph panoramas. There are many cases where using this feature is very helpful. Since in any of the automatic modes the camera uses its metering sensor to determine the optimal exposure, instead of having your camera re-evaluate the light every time you recompose, you could lock the exposure to a value you are comfortable with – hence the term “AutoExposure-Lock”. What does this exactly mean? If you are using any of the camera modes like Program, Aperture Priority, Shutter Priority, or other scene modes, the button could be used to force the camera to use a certain value for shutter speed, aperture, ISO, and white balance. The AE-L / AF-L button stands for “AutoExposure-Lock and AutoFocus-Lock” and its primary function is to lock camera exposure and/or focus. I will also demonstrate how I personally use this button on my cameras when I set them up. In this article, I will explain what the AE-L / AF-L button does, when it should be used, and how it can be combined with different autofocus modes. Whether you are using a DSLR or a mirrorless camera, the might be a special button on the back of it labeled “AEL” or “AE-L / AF-L” (in the case of Nikon) that can be quite useful in many situations.
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