When light hits a lens (or any material, really), refraction occurs because photons travel slower in glass (nearly 1/3 rd) than in the air. They approach the telescope lens, penetrate the lens and change direction as their speed changes (slows down) and change again when they exit the lens (go faster again).įigure 1. Photons come straight from objects, the Sun, stars. A professional telescope includes a precision lens by your eye piece so you can adjust the distance as required and make the image crisp. If it has an imperfections, though, it is likely going to always be somewhat off. Most retractable telescopes only work when fully opened to their full distance. The one on the far side and the one by your eye. whether you see a blurry image or not, depends on the correct distance between the two lenses. This means the focal distance is likely going to be somewhat messed up. How Do These Telescope Work?Ĭontrary to an astronomical telescope, the navigation telescopes are retractable. One reason was that these were easier to build since they did not require high quality lenses and tubes as astronomy telescopes. Remember, though, that navigation telescopes have never been as powerful as astronomy telescopes. After all, astronomy started to increase quickly at the time people started to get such telescopes (around Galileo’s time). I think these Brass Telescopes are a great gift to people who like navigating the seas and astronomers alike. I’ll talk about a few functional ones here, because I think. Some are functional, though, meaning that it is mounted with actual lenses. Many of these telescopes are just for decoration. With Pirate Movies we have seen a come back of those old Telescopes that navigators used for centuries before the GPS was publicly available.Īlthough often referenced as Pirate Telescope, those were regular captain navigation telescopes and pirates happened to steal them along other treasures.
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