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Physics of Depth of Field

Depth of Physics

Photography is an art which can be only done by an artist or a creative being because it is not a thing which can be learned, yes one can learn how to improve their skills but apart from that noting is here to learn about. When a photograph is taken from a photography camera, it works on its own set of rules and principles which are nothing. It’s just creativity which is used here; one can take whatever the type of shot they want and mix it with some new techniques and boom here we have a creative piece of art via a photography camera.

What is the depth of field- The distance between the nearest and the furthest objects that are in focus in an image which is clicked by the camera. Focal length determines the depth of field, the confusion size circle, and distance to the subject also determines the depth of the field. This process is done on site and some times in the photo studio. When this is done in a photo studio, then a method called focus stacking which allows one to extend the depth of field. This has opted when it is impossible to do on site. One can learn this method in the photography schools or photo sites, but nowadays photo sites are preferred more over the photography schools.

Factors affecting the Physics of the depth of field- There are various factors which affect the Physics of the depth of the field, and some of them are given below. They are as follows-

  • Lens aperture- Let’s take a subject and then adjust the framing and camera position according to it, but after that also the depth of field needs the lens aperture because this is what affects the most. Lens aperture is the ratio of focal length to aperture diameter that’s why sometimes lens aperture is also known as f-number. Here f-number is increased by reducing the aperture diameter than the depth of field increases because now only the light which is at a lower angle will pass through the decreased aperture. When the angels are low, then only the depth of focus will increase. This is mainly used in product photography because in the product photography the depth of field is the most important thing. Apart from this others use this technique in a limited manner, for example, the movie makers and the cinematographer because they only choose a single aperture setting, so they just adjust the exposure in the same setting for different types of shoot. Where there is variation in the depth of the field then there the aperture setting is changed more often to create something unique.
  • Circle of confusion- If one is willing to produce a point image of an object then they have to make a precise focus on the object then only a point image can be obtained, and for that, an exact distance is needed from the lens. If this is not done, then that point object will produce a blur spot because all the focus is on the object, so the blur spot is mainly shaped like a circle. When the focus is just normal, then this circle is so small which makes it unnoticeable. But apart from that, the other circle which can be noticed is called the circle of confusion, and this is considered to be very sharp. This is very important for the portrait pro photographer as this circle of confusion shows the experience of the portrait pro photographer. There are many photography blogs which are using this kind of techniques to list up there name in the list of best photography blogs as this attract more audience because of the creative editing and technique in the photography.
  • Movements of the camera- The movement of the camera is the main focal point as this decides everything and if this is done right then it eases their work. Two things are main here one is to rotate the plane of focus which can be done by moving the lens, and the other thing is to keep the plane of focus parallel to the image. The far and near limits of the depth of focus are no longer parallel when the plane of focus is rotated, and in some cases, this brings out the required image.

The depth of focus is mainly considered in stock photography and editorial photography because this brings the best in stock photography and editorial photography.

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