There are three ways to control your depth of field . You can adjust your aperture, change the distance of the camera from the subject, or changing the focal length of your lens. Usually, you first want to start by adjusting your aperture. Shooting at a lower f-stop decreases your depth of field, and shooting at a higher f-atop increases it. Adjusting the aperture will effect the exposure of the image, but you can increase or decrease exposure using other methods (adjusting light level, ND filters, iso/gain, or shutter speed/angle). You can increase or decrease your focal length by either switching lenses, or by zooming in/out of your image. Having a longer lens or zooming in (makes image more compressed and distance between objects smaller) will make your DoF shallower, and having a shorter and zoomed out image (makes objects in image appear further apart) will make it deeper. Lastly, the closer you get to your subject the shallower your DoF will become (you can also put more distance between your subject and the background, but it will affect the composition), and the further you are the deeper it'll be.
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