Even with a professional telescope it can sometimes just be mistaken for a star as it mostly looks just like a yellow, bright dot. The problem with Venus is that even if it’s “close” to Earth, it’s relatively small and it doesn’t have many recognizable features. Under perfect conditions, you might even be able to see its Moons. The icy poles might also be recognizable depending on the distance between Earth and the red planet at that moment. You will still be able to see a bit of detail and recognize some major areas in various color tones. Mars is a great target to look at in this range. Don’t expect to see, however, the Apollo landing site, or minor objects. They are more than enough to capture its craters and geological features very clearly and with high definition. The Moon looks amazing in these telescopes. Here’s what 100mm telescopes can do in general terms. The exact calculations can only be determined by knowing the telescope’s focal length, magnification, and even then, differences between telescopes can be perceived due to the quality of the lenses and mirrors or even outside variables like weather conditions.īut for the most part, an approximation can be made using only the aperture as it is the most important variable. ![]() There are a few additional variables that determine what you can view through your telescope lens and the quality of the image. You can find a more detailed list of the visible objects below. The quasar 3C 273 located in the constellation of Virgo would be in the limit of what is possible to see with a magnitude of 13. The maximum magnitude of a 100mm telescope is 13.6.įor reference, the Moon has a magnitude of -12.74 and Mars has a magnitude of -2.6. Any object with a magnitude below the telescope’s max magnitude should be visible. This value can be matched to the limiting magnitude (external link) of a celestial object (star, planets, the Moon, etc) which is basically the brightness of an object in the sky. Using the aperture of a telescope, a value called “maximum magnitude” can be calculated. In the case of 100mm, this is equal to about 3.9 inches. More light generally means a better, clearer, image, so a bigger aperture is almost always better, but unfortunately, it also translates into a higher cost.īecause astronomers prefer to use the metric system, the aperture is generally expressed in millimeters. ![]() This is the lens that captures the light in your telescope. The aperture in a telescope is the size (diameter) of the bigger, frontal lens. When a telescope is described as a 100mm telescope, or a 70mm telescope, or a 200mm telescope, it means the device has an aperture of that number in millimeters. We will consider “100mm telescopes” everything in the range of 90mm to 110mm as the difference in optics in that range is minimal. This article will help you better understand what you are going to see through a telescope of this size so you can tell if it’s the right fit for you or if you’d prefer to go with a different one. This is why we have decided to write a series of articles so you can better understand exactly what you can expect from a 100mm telescope. ![]() When it comes to telescopes, it can get a bit tricky because brands show you how they look on the outside or they list a lot of features and numbers that don’t mean anything to a newbie. It is important to know what you are going to get when you are looking to purchase anything.
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