Combination pre-focusing technique AF-L exposure lock and depth of field

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This technique of pre-focusing at a certain distance with a certain aperture is a very interesting way of photographing without wasting time and knowing how much depth of field you have at your disposal. We'll do it in three steps that I explain in the video, from setting the AF-L button to working as a focus lock, pre-focusing at a distance with which we feel comfortable and using an app like Photopills to determine the depth of field, so that photographing becomes something more simple and intuitive.
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Rober.