Telescopes that we are used to seeing in astronomical observatories and neighbors’ back yards are not the only types that exist. There are also infrared telescopes and radio telescopes. Optical telescopes are classified by their type of optical scheme. There are three basic types of telescopes: Each of them has its advantages and disadvantages. Refracting […]

Catadioptric, or mirror-lens telescopes, are compact and offer high optical performance. These telescopes are relatively expensive, but they’re worth the investment due to the high-quality images they produce. Many models can be equipped with computerized mounts. Catadioptric telescopes can feature mirrors up to 300 mm in diameter while still remaining quite compact. The optics of […]

In 1668, just 59 years after Galileo introduced the refracting telescope, Isaac Newton built the first successful reflecting telescope. His design was inspired by ideas proposed earlier by Scottish astronomer James Gregory in Optica Promota (1663). Newton’s breakthrough solved a major problem of refracting telescopes: chromatic aberration — the color distortion caused by lenses bending […]

When you go to the mountains, it’s not the best idea to rely on a cellphone for connection to your friends. Cellular coverage in the mountains is unreliable, and you risk ending up without a means of communication. Remember that it may be very dangerous in the mountains to stay without a connection. It’s not […]

Today, many people want to buy city radios for different goals. For example, walkie-talkies are very popular with airsoft players – they are a great opportunity to coordinate actions to demonstrate maximum efficiency in battle. They can also be a good choice for builders, security guards, drivers, and many other people. But you have to […]

At the beginning of a conversation on the radio, you need to name the person you are contacting and introduce yourself. Also, at the end of your phrase, you must mark its end. For this, use the word: “Over”. Here’s an example of a simple and clear conversation start: Mike to Daisy. Do you copy? […]

The police, military, air traffic controllers, and their affiliated services use portable radios as the main communication channel. And the technology of radio communication is imperfect – often the conversation is wedged in by interference created by various devices or natural phenomena. Therefore, to make sure that the interlocutors understand each other correctly, special Walkie-talkie Lingo have […]

✅ Very bright image, perfect for dusk ✅ Wide field of view ✅ Rubber cover. Binoculars Bresser Hunter is designed, of course, to meet the needs of hunters, bird watchers, and all nature lovers. They are cheap and perfect for everyday use. The models are made in a classic design with Porro prisms and feature […]

✅ Wide field of view and prism BAK-4 ✅ Durable, hard to break ✅ Cheap. Easy to adjust Metallic Russian Baigish binocular KOMZ BPC5 8x30M was released in 1982. Since then its image quality has noticeably improved (yellowness went away) and instead of old plastic (bakelite) eyecups, it has rubber ones. It is made with […]

The Baigish 50×50 binoculars were a free gift with my hotel room. They are made by a Russian company called KOMZ at an optical-mechanical factory in Kazan, which has existed since the time of the Soviet Union. KOMZ Baigish 50×50: a short review Well, it seems that the true power of the binoculars is only […]