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Comparison Konus Konusrex 10x42 vs Konus Emperor 10x42

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Konus Konusrex 10x42
Konus Emperor 10x42
Konus Konusrex 10x42Konus Emperor 10x42
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Product typebinocularsbinoculars
Magnification10 x10 x
Optical characteristics
Field of view 1 km away106 m98 m
Apparent angular field60 °
Real angle of view6 °
Min. focus distance2 m
Twilight factor20.520.5
Relative brightness17.617.6
Phase correction
Diopter adjustment
Design
Lens diameter42 mm42 mm
Exit pupil diameter4.2 mm4.2 mm
Focuscentralcentral
PrismRoofRoof
Prism materialBaK-4BaK-4
Interpupillary adjustment
 /56-78 mm/
Nitrogen filled
 /nitrogen/
General
Dustproof, water resistant
Case
Tripod adapter
Bodyrubberizedmetal
Size130х143х50 mm
Weight550 g760 g
Color
Added to E-Catalogjuly 2016september 2014

Field of view 1 km away

The diameter of the area visible through binoculars / monoculars from a distance of 1 km — in other words, the largest distance between two points at which they can be seen simultaneously from this distance. It is also called "linear field of view". Along with the angular field of view (see below), this parameter characterizes the space covered by the optics; at the same time, it describes the capabilities of a particular model more clearly than data on viewing angles. Models with magnification adjustment (see above) usually indicate the maximum field of view — at the lowest magnification and the widest angle of view. This information is often supplemented by data on the minimum value.

Apparent angular field

The angle of view provided by binoculars/monoculars and available to the eye of the observer. This parameter can be described as the angle between the lines connecting the two extreme points of the image visible in the eyepiece with the eye of the observer; in other words, this is the sector actually observed through binoculars (as opposed to the actual angular field of view described below). The greater the value of this parameter, the greater part of the observed space can be seen without turning the instrument. On the other hand, a wide field of view reduces the magnification factor (see above) — or significantly increases the cost of the device compared to more focused ones.

Real angle of view

The section of the panorama that can be viewed through the eyepieces of binoculars. The higher the actual angular field of view, the wider the visibility of the optics. Note that the angular field of view has an inverse relationship with magnification. That is, the higher the magnification, the narrower the visibility (the smaller the real angular field of view). The actual angular field of view is calculated as follows: you need to divide the angular field of view (in degrees °) by the magnification factor. In comparison, the human eye has an angular field of view of 60 arcseconds (“). In terms of degrees, you get 150 °. Good binoculars provide a real field of view somewhere within 10 arcseconds. But it does not always make sense to chase after large indicators of the real angular field of view. The fact is that when viewing a large section of the panorama, the edges of the image receive noticeable distortion.

Min. focus distance

The smallest distance to the observed object, at which it will be clearly visible through binoculars / monoculars. All such optical instruments were initially created for observing remote objects, therefore, not all of them are able to work at short distances. When choosing a model for this parameter, one should proceed from the expected observation conditions: ideally, the minimum focus distance should not be greater than the smallest possible distance to the observed object.