المسافة فوق البؤرية .. كتاب التصوير علم وفن

Hyperfocal distance

If we set the focus ring in the lens to the infinity mark, the image is collected on the film in the focal length of the lens exactly, and it is completely sharp. And if we make the lens at a distance farther from the film (exactly at closer distances), we find at the beginning that the closest objects are sharp, while the objects in the distance are still sharp as well until the distance of the lens reaches a certain limit, and then we notice that if we extend the lens further (exactly at Closer distances) when details appeared sharp in distant objects. Here it is said that the lens is set at the suprafocal distance, which can then be defined as the distance in front of the lens at which, if the lens was set, the depth of field would extend from the middle of this distance to infinity. And we need to know this hyperfocal distance sometimes in order to get the maximum sharpness in the details with the least narrowing in the aperture, especially when photographing landscapes.

The hyperfocal distance can be calculated with various calculations over which photographers disagree, but there is a very simple and practical method by using the depth of field calculator on the lens.
This method is as follows:

We come to the depth-of-field calculator and put an infinity mark (0) in front of the required lens aperture, let it be 16. The depth of field is between infinity (5) and the distance in front of the number 16 is the same aperture on the other side of the depth-of-field scale) for example 2.5

meter. The suprafocal distance is the distance in front of the lens distances mark = 5 meters, twice the closest distance to the depth of field, and do not forget after that to set the pupillary aperture to the same aperture, i.e. number 16 in the example
Long focal length lens

Some shots unless you have a camera with self-focus, you will find that you will lose, especially in fast-changing situations while you are still messing with the distance control ring, so one of the famous photographers once said: “When I am at a party, for example, I know that the events will take place at a distance of 2 to 5 meters, so I set the distance on this basis, for example, three meters, and I make sure with the depth of field scale that the depth extends from 2 to 5 meters, then I set the lens aperture on this basis and the appropriate shutter speed for the level of light and that aperture, and here it is easier for me to rush to a distance of 3 meters from the event instead. Adjust the lens and press the trigger at the crucial moment when everything falls into its natural place to give a meaningful formation.
Also, on trips, set your lens to hyperfocal distance so you're always ready to catch the action quickly because you know everything will be in order.
Steep a certain distance to infinity.