How to Buy Letcase Binoculars


Lens coating
The next thing to consider is the lens coating. Due to the laws of physics, some of the light that reaches the surface of the lens is reflected back. Coated optics help reduce the amount of light reflected. As more light is reflected rather than transmitted, the result is a reduced view of the scene or object in the field of view. Fully multi-coated lenses are ideal. It is worth noting that many studies involve different lens coatings, not all coatings are equal. As a general guideline...

Coated optical component - a single layer on at least one lens surface.
Fully coated optics - a single layer of all air to glass surfaces.
Multi-coated optics - having multiple layers on at least one lens surface.
Fully Multilayer Coating Optics - Multiple layers on all air to glass surfaces.
Wind and rain
How likely is it that you need to rely on binoculars during a rainstorm? Most of us, in the wild, want to make the most of this opportunity, and generally don't let the rain break our fun. Unfortunately, like any glass surface, the view may be distorted due to moisture buildup on the glass lens. Again, this may be a matter of time. Stopping the wiping of the lens may result in a loss of chance, or if you don't have a soft lens cloth, it may even scratch the lens. Some manufacturers have additional proprietary coatings that actually cause the water to turn into beads and roll the lens, allowing for continued use during rain. This is not an alternative or alternative coating for fully multilayer lenses. These coatings do offer a lot of value for serious hunters or birds.
Specifications are also important
Binoculars are specified by their magnification and objective diameter; for example, 7x35 means that the binoculars will magnify an object so that it looks seven times closer (7x) than the actual object. Numeral 35 denotes the objective lens diameter in millimeters, which are concentrating lenses.
The exit pupil is an optical specification that defines the size of the eyepiece light (in millimeters) and should match the diameter of the iris to obtain a viewless view. Calculated by taking the objective size and dividing it by the magnification. The average pupil is enlarged by about 2 mm in bright sunlight and 7 mm in low light. This range also varies with age. (Most adults average about 5 mm) The size of the exit is a more important factor when using binoculars during low light hours. Manufacturers design medium and full size binoculars, taking into account the withdrawal of students. The only exception is the compact binoculars, which have a very small exit pupil size - usually in the range of 2.0 to 3.0 mm.
Eye relief is measured in millimeters to measure the distance the eye should be placed away from the eyepiece for a completely clear view. Short eye reliefs do not allow the wearer of the glasses to see the full field of view because the user cannot bring the binoculars close enough to their eyes. Includes eye masks to help position your eyes properly. It is more desirable that the system employed can be as simple as a rubber lip that rolls down, or can have an adjustable cup with a twisted preset.
The field of view is a measure of the width of the view at some standard distance of the low field, usually at kilobytes - for example, 300 feet at 1000 yards. Depth of field is the total distance of the field that enters the focus.
The shape of the binoculars is based on the type of prism used, whether it is porro or roof. Porro prism binoculars are the traditional style we define, where the eyepieces are inconsistent with the objective. On the other hand, the roof prism does have an eyepiece and an objective lens. Roof prism Letcase binoculars are more compact and rugged than Porros, but are more expensive to manufacture.
Hunter's optional features
Some binoculars can use rangefinders or mil-dot crosshairs, and even view the compass in binoculars when using them. The combined feature allows hunters to carry fewer tools while hunting, while providing tactical information that helps users become more successful.
More giving and receiving
Let us now talk about the magnification. As the magnification increases, the field of view will narrow and eye relief will decrease. In addition, it is more difficult to keep the binoculars sufficiently stable without moving in the field of view when selecting a large magnification. These compromises can be easily noticed when using a zoom binocular that allows for a variable magnification range (eg, 10x to 30x). In addition, in maritime use, continuous oscillations and rolling by water also produce motion, and smaller magnifications and larger objective sizes will allow for more mobility tolerance. So please carefully select the magnification, 7 times or 8 times.

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