What focal length means? - simply explained
- Subject-specific terms, the term "focal distance" describes the distance between the lens and its focal point where the light rays from the lens in a point, be concentrated. The focal length determines how big the image or the image angle is to be imaged on the camera sensor and thus photographed.
- The focal length is specified in millimeters (mm) and is usually on the lens (see photo). Especially when dealing with SLR cameras you have to with focal lengths deal.
- A lens with a short focal length of, for example, 18 mm shows a large image section. This value is a wide-angle focal length, and is used when a short distance from a wide-area subject, such as, for example, a mountain lake, photographed to be.
- You want to corresponds to a portion of an image of the angle of the human eye, then a Normal focal length of about 50 mm is recommended.
- If you want to photograph a subject in a larger distance, such as by way of example a cross on the summit, or a ship on the horizon, then you need a lens with a telephoto angle. The tele focal lengths starting from 70 mm.
- The focal length change at a constant location only the angle of the picture, and as a result, the perspective of the photographer. The choice of subject has an influence on the chosen focal length. A short focal length allows a large angle with a smaller figure and a long focal length ensures a small angle of view, with an enlarged illustration. The zoom in and zoom Out is, ultimately, just a change of the focal length.
- In the case of a short focal length (10 - 35 mm) you will receive for your image of a large depth of field and a long focal length, you get a low depth of field. Taking into account this knowledge, you can make, for example, Portraits of active.
What focal length means?
In addition to the correct focal length, the ISO - value is crucial. What is the term ISO means and how the value is correctly set, we explain step-by-step, in a further article on photography.
