What does Binoculars 10×50 mean?3 min read

Binocular is a type of telescope which are mounted and both telescopes are aligned to the same direction. This two telescopes allowed the viewer to see objects in a distant location. Binocular gives the viewer a 3-dimensional image of the object.

Things You Must Know About Binoculars

What does Binoculars 10x50 mean?

Many people are getting confused about what is the meaning of two numbers in binoculars. The first number is the magnification and the second number is the objective lens. For example, if you 10×50 binocular, this means that the magnification is 10 and the objective lens is 50. The objective lens also indicates the size of the lens in millimeters. This means that the objective lens in the example is 50 millimeters in diameter. Magnification also indicates how close the object appears when you look it in the Binocular. The one that is farthest from the eyes of the user of the binocular is the largest lens. The larger lens, in short, is the objective lens of the binocular.

In binocular, there’s what we called the exit pupil. Exit pupil is where light travels through the eyepiece. It is the hole which you see through to see the object. It is said that the bigger the exit pupil of the binocular, the brighter the image it produces.

Eye relief is one of the important terms that you should understand in binoculars. It is the distance where the observer will position hi or her eyes. If the focal length is long the more chances of shorter eye relief, the position of the lenses in the eyepiece will surely affect the ability and quality to focus.

Glass- using specialized glasses for lenses are best for it transmit light better. The imaged produced clearer, and you can see a true color out of it. Some binoculars are made up of eco-glass. As implies on its name, eco-glass means an ecologically friendly glass. Compared to another type of glasses it doesn’t use lead. This kind of glass will not affect the image the binocular will produce. You will not worry about chemical pollution if it breaks. You can dispose of it easily for it is an eco-friendly glass.

What are the Different Types of Coatings?

There are two different types of coatings, prism coatings, and lens coatings.

Prism Coatings- it improves image brightness and contrast. The dielectric coating also provides brighter imager for it allows light through the prism. There is also what we called the phase-correcting coating. This phase-correcting coating separates the beam of light that travels in the prism.

Lens Coatings- these are coatings which are being applied to the surfaces of the lens. When applied this increase the transmission of light and colors are more visible. Coatings do not affect the quality of the images. Multi-coating is also done sometimes on the lens. This means applying multiple layers of coating on the surfaces of the lens. This will result in a higher ability to transmit light. It also enhances the color that can be seen in the image. Applying these coatings are best done for clearer result and best performance.

Focusing the binocular is an essential skill that you should learn. Most of the binoculars, the focus is on the center portion of the focus system. In focusing there are two ways of focusing binoculars. First of it is the Individual Focusing. Individual focusing reduces center focusing on enhancing the ability to focus independently. It is just that sometimes it is a little bit frustrating when focusing individually. The second type of focusing is focus-free. In focus free this allows the viewer to enjoy the view and enables the eyes to where it wants to focus. Free focus does not have any focusing mechanics compared to individual focus. For persons who have poor and weak eyes, the free focus is not good for them. It is because there are cases that it is very discomforting to the eyes. It is also more stressful to use compared to individual focus.

What is SK15, BK7, BAK4 Prisms?


What does Binoculars 10x50 mean?
SK15 Prism

It is a type of glass which has a higher refractive index and images that can be seen are very clear.


What does Binoculars 10x50 mean?

It is the most popular and most used binoculars in today’s generation. Even though it produces a low-quality image, it has excellent transmission properties.


It is also known as Barium Crown glass and is the best-known type of glass or prism. It transmits light better because it has a high refractive index compared to other critical materials.

If you are planning to buy a binocular, take note that the larger or bigger the lenses, the more expensive is the optics — the closer the image to want the higher its magnification.

Types of Binoculars

Porro Prism Binoculars

What does Binoculars 10x50 mean?

Porro prisms are used to erect the image. This applies to those images which are wide which has objective lenses. It is designed to give an awesome view of the depth, and it helps to lessen the focal length of the object. The world “Porro” comes from the inventor of Porro prism which is Ignacio Porro.  It looks like old and traditional binoculars. This binocular also produces a brighter image compared to other binoculars. It is also less expensive and affordable compared to other binocular. It also produces good optical quality.

Galilean Binoculars

What does Binoculars 10x50 mean?

Galilean optics are mostly used in binoculars. It uses convex and concave lenses which produces an erect image but on a narrower perspective.

Roof Prism

What does Binoculars 10x50 mean?

Roof Prism is narrower and compact compared to Porro Prisms. It produces different image brightness unlike to Porro Prisms. It is made up of silver surfaces which reduces the light being transmitted. It is also used to correct image vertically and horizontally which maintains a straighten as light passes through the prism. It is easier to fold and tougher than Porro prism. It is just that roof prism is more expensive than any Binoculars.

In making use of binoculars, it is advisable that you have clear knowledge and understanding about it. You must take into consideration the binocular which is best for you.