If you have an SLR camera or a camera equipped with a much larger matrix than in the case of ordinary compacts and you want to take an interesting landscape photo, it will require a little more effort than just pointing the lens in the right direction and pressing a button.
In the case of such a camera we have to reckon with a much smaller depth of field. In most cases, such a large sensor can be found in SLR cameras, although nowadays, mirrorless cameras with similar parameters are also gaining more and more popularity. The size of the sensor has an impact primarily on the normal focal length.
In the case of SLRs, it ranges from 25 to 43 mm - a significant difference compared to compact lenses, where the focal length is about 7-10 mm. The actual focal length is very easy to check - usually found engraved on the camera lens.
Zoom lenses allow you to adjust the focal length in specific ranges. In the case of telephoto lenses, the focal length is much longer than normal, while that of wide-angle lenses is shorter. All the time we talk about real focal lengths. The actual length of the focal length can determine the depth of field of view.
The depth of field is usually inversely proportional to the square of the actual focus. So with 2x longer focal length, you get 4x less depth of field. People who have previously only used compact cameras and suddenly changed their camera to an SLR camera may have some difficulty getting used to much smaller depth of field. This is especially problematic when photographing landscapes, when we need a picture with a high distance range.
In the case of compact cameras, the depth of field is practically always big enough to be practically the only problem when reducing it, mainly when taking portraits. If we want to take a really good SLR image, we will have to do much better - getting satisfactory focus is not as easy as it might seem.
In order to obtain satisfactory results, one should first of all set a large aperture value f. However, we cannot exaggerate with this, because too large a value leads to the phenomenon of so-called diffraction. This factor is extremely important - we have to choose its value on the basis of what exactly we photograph and what objects we photograph. Of course, there are many other functions that can influence the quality of a photograph taken by us - all of them should be taken care of with the utmost attention.