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What is the Depth of field?

Depth of field is the distance between the closest and most remote parts of a subject can be achieved as a photo image with reasonably accurate details at a focus setting of the lens.


The widest aperture - lens aperture - gives the smallest depth of field, while the smallest aperture gives the biggest.


There are two additional important impacts:


(1) the depth of field decreases when you photograph in close-up and increases when your entire subject is further away.


(2) the longer the focal distance of your lens, the lower the depth of field, even with the same openness and the same distance from the subject.

Practical significance


It is very important to be able to check the depth of field and make it work for your photos, not against them.


Choosing a shallow depth of field allows you to isolate one element from the other at different distances.


You can focus on the environment and "suggest" it without showing it in detail to the point of clutter and confusion.


They call these images "differentiated". But remember that minimizing the depth of field with a large opening also means that you need to be accurate with your focus.

- there is significantly less room for error.


You can also have exposure problems if you choose to fire at a large opening in bright lighting, with fast movies, or you want to create blur effects by using a slow shutter speed.


In addition, by choosing the greatest depth of field possible, your image will contain as much information as possible.


An image that is sharp throughout allows the viewer to decide what to concentrate on rather than being directed by the photographer.


Just pay attention if you notice any undesirable disorder in the foreground or the background. Almost all SLR cameras show the picture with a wide aperture, making the picture as bright and easy to focus on as possible.


The objective stops only at the aperture defined at the time of exposure. Some cameras let you preview the still image using a lever or button on the camera objective or body. This is a very useful function as it allows you to check the scope of the targeted area.


There may also be depth of field marks on the muzzle of the lens. Sometimes it is not possible to produce an adequate depth of field by stopping. In such cases, take any measure which reduces the picture. Back out or use a shorter focal length or a smaller camera. Later, you will need to enlarge and crop the image in print, but you always gain on the depth of field. You can use a tripod or monopod if conditions permit.
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