It is worth paying attention to which glass is used in binoculars, telescope or telescope lenses and prisms. Szkło do przeznaczenia w wykorzystaniu w sprzęcie optycznym powinno spełniać szereg różnych mniej lub bardziej ważnych wymagań określonych przygotowanymi kiedyś konkretnymi normami. All types of glass used in the optics are called optical glass, and its production technologies are specialized and more and more advanced – This cannot be compared with the glass used in everyday use – in the shafts, mirrors, itp.
Optical glass will be easiest to divide into 2 General groups:
–Flinty, where the collapse coefficient(n) it is big, and the dispersion factor(v) it is small,
–Krony (Crown glass), in which we observe the opposite situation than in Flinty.
Different glass species differ in weight and color. Ordinary cheap binoculars most often contain white glass and additionally used some types of polymers, which means, that they are not that good. A decent binoculars at a reasonable price usually contains yellow glass.
View to kolejna ważna i charakterystyczna cecha każdej nowo kupowanej lornetki. It is in short speaking the area of what we see after joining our eyes to the binoculars. This property does not affect the size of the observed object, zależy on tylko i wyłącznie on enlargement and not as if it may seem depends on the lens lenses, but rather by building prisms and glasses.
The unit characterizing the width of the field of view are angular steps or linear width( in meters per 1000m – Which means how many areas we can observe by looking at the binoculars when the object we observe is located at a distance 1000 meters from the place of observation).
Due to the field of view, the name of the wide -angle binoculars was created (z ang. wide angle). They are binoculars, in which the field of view is greater than the average (The field of view times the magnification is greater or equal to values 60). Such binoculars is more useful than others in hunting and in astronomical observations.
