Dealing with depth of field
The image you see through the viewfinder or on the Live View screen is displayed at the lens’s widest aperture to ease focusing using the brightest image possible.
This can be a problem when it comes to judging depth of field at different apertures. Handily, your DSLR likely has a depth-of-field preview button. Press this down as you adjust the aperture and you’ll be able to see the depth of field change.
Using a narrow aperture of f/22 means that the depth of field extends closer to the camera and beyond the point of focus. However, the narrow aperture will result in a slower shutter speed and the potential for blurred shots caused by camera shake.
A wider aperture of f/2.8 leads to a very shallow depth of field, enabling you to make a sharp flower stand out in a sea of blurred ones. However, you need to be spot-on when focusing with such a narrow band of sharpness or key details will be soft.
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