So you know, whatIn general "bracketing" means in general... taking a series of shots other thannear the onesettings you or the meter haveyour camera has chosen.
There are two kinds. Exposure bracketing is the most common. Right. It is done by the photographer or automatically byattempts to achieve the camera, by taking anperfect exposure at the suggested speed, aperture and ISO settings, and then one or more exposures using a different speed, aperture or ISO setting -- but always only one of these.
DoF bracketing is less common because DoF can be considered part(sort of the composition and is a matter of artistic interpretation, something better left to the photographer rather than the camera. Like exposure bracketing, it can be done by the photographer orshotgun approach) while the cameragoal of Depth of Field (assuming your camera has DoF bracketingDoF). But DoF bracketing is done by taking one exposure at the suggested speed, aperture and ISO settings, and then one or more exposures using a different aperture and a complimentary change in speed or ISO setting to compensate forachieve the change in aperture. So, two settings are changed not just oneperfect composition.
If you can't think of a reason to use DoF bracketing, try to come up for a reason to use either speed or ISO bracketing in general use.
Exposure bracketing involves the photographer or camera takeing an exposure at the suggested speed, aperture and ISO, then one or more exposures while varying either the speed, aperture or ISO setting. Usually, there is one or two over and one or two under the suggested by a full, half or third stop.
DoF bracketing can be considered part of the composition and artistic interpretation, something better left to the photographer rather than the camera. First, one exposure is taken at the suggested speed, aperture and ISO settings, and then one or more exposures are taken while varying the aperture and a complimentary change in speed or ISO setting that compensates for the change in aperture. So, two settings are changed not just one.
In the case of CanonCanon cameras, however, there was once had a function also called DoF bracketing that allowed the photographer to focus onto select the nearest point they wanted in focus, take a reading by partially depressing the trigger, and then a second reading at the furthest pointpoints they wanted in focus and taking a second reading. This locked in that focus range by setting the aperture automatically and allowed the photographer to the photographer or program mode to modifyeven while modifying the other two settings as needed to keep the focus. I haven't owned a Canon or worked at a camera shop since MosesMoses' time so I'm not sure if Canon still uses that terminology.