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However, it is not always easy for the automatic device to be able to distinguish the best point of focus, although on reflexes you can choose the points and areas that should be used to calculate distances, the device could find difficulty in correct setting fire. Or more simply the firing of automation does not coincide with the will of the photographer. To work around these problems, you can switch to manual mode, which in most SLRs is done by moving the switch from AF to M directly on the lens and using the barrel rotation device to approach or move the lens away from the sensor and find the correct fire point.

What does it mean to focus on a composition? It does not necessarily mean that all photography should be in focus perfectly, but it is possible that the need for the composition can make it perfectly sharp only the main subject. Let's see some situations and how to behave in that case.

Main subject is distant objects
It is perhaps the least complex situation. The subject must be pointed at a considerable distance and the diaphragm can be quite open

Subject includes near things and distant things:
If our subject is composed of things near and far you need to make decide how the camera should be set to have the desired focus. Let's look at the cases where:
  • All composition must be in focus (landscape photos)
To achieve the solution to this situation you have to calculate the hyperfocal distance. Hyperfocal distance is the distance beyond which all objects have acceptable sharpness, setting focus to infinity. Once the hyperfocal is calculated, simply focus at that distance to have the entire frame at an acceptable sharpness. But how do you calculate this distance? There is a mathematical formula for calculating this distance
  • The background must be blurred
You point the subject that needs to be focused and open the diaphragm of the lens. The more open the diaphragm, the more blurred the background and the subject is isolated. Keep in mind that the lower the focus, the greater the depth of field and the less blurring the background.

Main subject is made up of things at a little more than a meter
Here the situation is more critical as the closer we get to the lesser subject is the depth of field and the photo may be blurred both behind and in front of the main subject. If the blurring behind the subject can be useful in isolating the subject and is accepted by the human eye, a blur in front of the subject is not tolerated. To work around this problem it may be enough to focus at a smaller distance than the main subject by paying close attention to the depth of field that can be very limited

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