A scatter spot (circle) is a distorted image of a point projected by a photographic lens onto the camera’s matrix or film. These distortions are caused, firstly, by structural factors, i.e. natural imperfection of optics and photosensitive material, and secondly, functional reasons, and above all – selective focus. An image of an infinitely small point can be a point only when it lies strictly in the plane of the matrix or film. If the image of the point is out of focus, the point turns into a blurry spot of rounded shape, the size of which increases with distance from the plane of the ideal focus (see also “Bokeh”).
Formation of a scattering circle. Continue reading
The dynamic range or the photographic latitude of the photographic material is the ratio between the maximum and minimum exposure values that can be correctly captured on the image. In relation to digital photography, the dynamic range is actually equivalent to the ratio of the maximum and minimum possible values of the useful electrical signal generated by the photosensor during exposure.
Dynamic range is measured in steps of exposure (EV). Each step corresponds to a doubling of the amount of light. So, for example, if a certain camera has a dynamic range of 8 EV, this means that the maximum possible value of the useful signal of its matrix refers to the minimum as 28: 1, which means that the camera is capable of capturing objects within one frame that differ in brightness not more than 256 times. More precisely, it can Continue reading
Is sharpness important for a good photo? Yes and no. On the one hand, technically perfect photography, as a rule, should be absolutely sharp. No matter how entertaining it may be in artistic terms, the fuzziness of plot-significant elements will make it suitable only for an amateur photo album. On the other hand, if a photograph is technically perfect, but devoid of artistic or at least protocol value, then it is generally unsuitable for anything. In other words: sharpness is important, but you should think about it only when the lighting, composition and other fundamental aspects of photography do not cause you any Continue reading