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An anxiety disorder is a common mental illness defined by feelings of uneasiness, worry and fear. While anxiety occurs for everyone sometimes, a person with an anxiety disorder feels an inappropriate amount of anxiety more often than is reasonable. For example, an average individual may feel some anxiety before going to a dentist appointment but a person with anxiety disorder may feel anxiety every time they leave their home. Getting fighting fit Therefore, when shooting in macro, it is easy to get a shallow depth of field if utilizing a large aperture. We often make use of the F8, F11, F13 such small, and medium-sized aperture to look at photograph to ensure the photo has clear range. If you use a 100mm macro lens to shoot the insects' close-up, even with the F13 aperture, the depth of field is extremely shallow, and sometimes need to utilize the manual focus function to carefully adjust the focus position to spotlight your eyes of insects to make the image more vivid.