The depth of field is closely linked to the opening of the diaphragm, including treat of her in the article explaining this pillar of the photometry.
However, I found it necessary to explain in an article the part what is depth of field.
In short, depth of field is the area in which things will be focused on your photo.
In fact, there is only one focus point, but around him, closer or more distant, the focus will gradually losing. Still, there is an area where the focus is acceptable. Is this acceptable area we call the depth of field.
There are many calculations to determine the depth of field, but I’m not going to complicate things. Just you know two basics.
Rule 1: depth of field- Opening dodiafragma.
I already explained this in an article here, but I will give a brief passed.
The diaphragm is an existing piece on the lenses of DSLR cameras (Reflex) that allows the passage of more or less light, explained by internetiest.
He is represented by the letter “f”. The greater the number of f, less light enters the equipment and the greater the depth of field.
Let’s get a 50 mm f/1.8 lens for example. She will bring a depth of field too small, at the same time light more photography. If we change to a with f/4, she will bring a greater depth of field (see photos below).
Rule 2: depth of field–focal length.
Commonly called zoom, the focal length is what determines the area that the lens will cover. A lens with focal length 8 mm, covers an area of almost 180°, 50 mm already covers an area around 50°. That is, the more “mm” greater is the “zoom”.
Applying in depth of field, the larger the lens, the greater thedepth of field.
Therefore, an 8 mm lens has a greater depth of field than a 50 mm.
With this in mind, you can more easily, learn how to blur the background of photos (Bokeh).
Is also very important to know these optical characteristics in the photo, this will help you to get more control over your equipment and bring the results you expect.