The twilight factor is an indicator that we encounter when choosing binoculars or a spotting scope. It reflects the ability of an optical device to show a detailed image in low light conditions. Theoretically, the higher the twilight factor, the more the binoculars can perform twilight observations. Twilight factor of 17 or higher is considered […]

Good afternoon, dear readers! Today let’s talk about magnification of binoculars. Undoubtedly, magnification is one of the most important characteristics of any optical device, which we certainly pay attention to when choosing one. At first glance it may seem that the question of choosing magnification is not worth an egg: the bigger, the better. But […]

Perhaps, when choosing binoculars, you often encountered two concepts: ED-glass (with extra-low dispersion) and BaK-4 prism glass. Both of these characteristics affect the image quality, but in different ways. Let’s figure out today what is responsible for and how it affects the quality of optics. What is ED Glass? ED stands for “Extra-low Dispersion”. That […]

Optical coatings are thin layers of special materials applied to the optical elements of binoculars, such as eyepieces and objective lenses, as well as prisms. Their main purpose is to reduce light reflection from optical surfaces, which lead to light loss, and to increase light transmission within the entire optical system of the binoculars. Thanks […]

What telescope owner has never thought about photographing the wonders he sees in space? Modern technology makes it possible to take photographs using a smartphone, attaching it to the eyepiece of a telescope. However, there is also a special device for astrophotography – the astrograph. What is an astrograph? An astrograph is a camera with […]

PMR (Personal Mobile Radio) – is a standard for unlicensed radio communications, used in Europe, but prohibited in the United States and Canada. Depending on the country, the number of channels and terms of use may vary. PMR channels Since 2018 this communication standard includes 16 channels (before there were only 8) with a step […]

The LPD (Low Power Device) channels are dedicated for civilian communication within the UHF frequencies, as much as PMR446, another free band. LPD channels are located in the frequency range 433.075–434.775 MHz and include 69 channels with a step of 25 kHz. You can see them in the table below 👇 Many countries allow the channels to be used […]

Morse Code Tables   For more than a century, Morse code — a technique for sending messages using a series of dots and dashes — has been a crucial part of communication. Even though there are speedier ways to communicate these days, Morse code is still useful for walkie-talkies, amateur radio, and emergency communications. Its history, […]

Radio stations became widespread during World War II when the need for fast communications over long distances increased. In those days, a stationary radio was used, but it was huge, and communications men carried such 2-way radios after their officers. Walkie-talkies also already existed, but they were far from a modern compact walkie-talkie we have […]

What is a portable device that can transmit your voice through the air, but is not a mobile phone? It seems you’ve heard something about an outdated appliance called “radio”… wait a minute! Does it still exist? Oh, yeah! It exists and it’s not going to die anytime soon! Walkie-talkies versus cell phones Two-way radios […]