What is the depth of the camera on the lens there is a circle around the symmetrical aperture scale, what is the role of how to adjust the aperture and speed to meet the required depth of field requirements
If you need a large depth of field, give priority to select a smaller aperture, with a slower shutter to ensure that exposure to moderate. On the contrary, if you want to highlight the theme of small depth of field, with a large aperture, fast. In the static state of the object, the speed can be set too slow, select a smaller aperture; shooting moving objects, in order to avoid shooting images made virtual, should choose fast, large aperture.
From the depth of field table, the depth of field with the set aperture value changes: large aperture depth of field, small aperture depth of field long. Depth of field also changes with the subject distance, when the lens close to the scene when the focus, the depth of field is short, when the distance of the object is very long.
There is a circle around the camera lens symmetrical aperture scale, which is called depth of field table. It can point out the subject before and after a clear range of distance. This depth of field tells us that when you use a certain aperture value photography, in this symmetrical depth of field ruler, find a set corresponding to the aperture number you use the scale and the corresponding distance range, this distance range Inside the scene can get a clear like.
A: The focus of the main plane of the scene in the film will form a clear image, in front of somewhere to its rear somewhere in a range, the scene can form a clear image, this range is called depth of field.
