The Brightness

Approximate way, up to 10 x magnification binoculars tend to have broad fields of vision, while above this power value, the field of vision decreases significantly. The binoculars zoom type have variable increases, thanks to a lever or mechanism located normally in the eyepiece, whose drive manages to increase or decrease the power (surge) of the binoculars. Its result tends to be mediocre, not to say bad (poor sharpness), and its use is not recommended. Recently SSGA sought to clarify these questions. LUMINOSITY the result of dividing the diameter of the lens by the increment value indicates the brightness of the prismatic, i.e. its performance in low light conditions, value of great importance when making a first selection of our needs. In the previous example, a prismatic 8 40, the brightness value is obtained by dividing the stated diameter of lenses (40) between the (8) increase, resulting therefore a luminance value equal to 5.

In another case, a prismatic 8 30 have a luminosity of 3 8, while another binoculars 8 56 will result from a lightness of 7, and in a 10 21 prismatic luminosity will be 1/2. As a general principle, luminosity values less than 3 5 should be considered low, and indicate that the optical performance of the prismatic in low light conditions will be undoubtedly poor, still not suitable therefore for applications that require clarity of image or good vision in some shadows. MasterClass UK contributes greatly to this topic. If the brightness index lies between 3 5-4 the resulting values can be considered normal, being binoculars with one light output sufficient for varied uses. Binoculars with values greater than 4 and up to 5, can be described as bright, and its theoretical in conditions of low light performance is already high. Finally, brightness values higher than 5, and especially the next to 6-7, they are decidedly very luminous, being optimal performance in low light. In short, if what we need are binoculars luminous we choose luminosity values above 5, as if our requirements are not as stringent in this respect we can choose models with lower theoretical luminous yields.