BinocularsA prismatic is that linked to prism. This term (prism), meanwhile, refers to a body that is made up of two flat polygons as bases and with a variable number of parallelograms as sides.

In the field of optics, a prism is a triangular shaped glass element that is used to generate the decomposition, refraction and reflection of light. This definition allows us to delve into the idea of ​​binoculars.

The binoculars are glasses that, inside, have tubes with prisms that allow the enlargement of images. These prismatic glasses, also known as prismatic cufflinks, are used to observe objects that are to great distance.

The binoculars have two tubes. In each of the tubes there is a prism and several glasses that allow to enlarge the image for each eye. Thus, binoculars generate the stereoscopy (the feeling of depth or relief).

Because they allow you to look with both eyes simultaneously, binoculars are binoculars. The user can focus the image easily thanks to a small wheel.

Binoculars are classified according to the diameter of their objective and at the image magnification level. Binoculars 10X60To cite one case, they make it possible to enlarge the image ten times (10X) and have a target of 60 millimeters diameter. If the enlargement is 12X or longer, binoculars must have a tripod or other support, as natural hand movements cause the image to shake.

One of the myths that they are spread incorrectly among those who want to start in the world of sighting through binoculars is that a greater number of increases results in a better experience; but this is simply not true. The key to choosing good binoculars is to find those that allow us to satisfy our specific needs, and for this we must ask ourselves a fundamental question: what do we want to observe? Common responses include “birds,” “the stars,” and “landscapes.”

Long-range binoculars have a number of disadvantages that we must take into account before buying. Despite offering a large number of magnifications (12 or more), they can generate the following problems:

* vibrate too much: As mentioned above, from 12x it is necessary to use a tripod to stabilize the image, because the pulse of our hands can generate images that move uncontrollably. This phenomenon is directly proportional to the amount of increases, that is, it becomes worse the more they are;

* smaller field of view: this means that the images are not panoramic and, therefore, it is more difficult to locate the objects we want to observe, whether they are stars on a clear night or birds in flight;

* greater darkness: since the size of the pupil output is lower, images appear darker;

BinocularsHere are some examples of the most common uses of binoculars according to their amount of magnification:

* with zoom: this is the basic option, which allows us to adjust the increases without exceeding a relatively moderate range. The image quality is much lower than that of binoculars with a fixed number of magnifications;

* with 7x or less: fields of wide vision but more distant images, perfect to observe animals in movement and for an orientation when observing the sky;

* from 8x to 10x– The ideal amount of magnification for bird watching and general nature observation, although they are also used in astronomy. The images have a good level of brightness;

* with 12x: observation of animals from a long distance and from a fixed point, since they require the use of a tripod;

* with 15x or more: to observe the stars and other planets. The tripod is also necessary.