![]() ![]() Unless you, your parents or some friend has a car that you can use to transport larger telescopes, you should settle with some smaller telescopes. Some telescopes can be a bother to transport. Having a huge aperture and great focal length comes at a price, both in terms of money, but also in terms of portability. That means that a 100mm telescope would have a practical magnification limit of 200 times. You must need to double the objective’s diameter in millimeters. If you want to calculate the magnifying power of a telescope, you can do so pretty easy. Think about it this way – zooming into an image which has a low resolution will barely help you identify small object any better than not zooming in at all, but zooming into a picture with a high resolution is definitely helpful. A huge focal length only makes sense if the aperture is high enough to begin with. If you want to look at specific celestial objects, a bigger focal length might be more desirable, but if you want to look at solar systems or whole galaxies, a smaller focal length might be more of an advantage.īut problems with focal length don’t stop there. The rule of thumb is that bigger focal length allows for bigger magnification. The focal length determines the magnifying power of a telescope. The focal length is the distance between the telescope’s objective and the point where the light rays come together in focus. This also means that a big aperture will allow you to identify fainter objects in the night sky. It doesn’t matter if the objective is a mirror or a lens, what matters is that a bigger objective creates a sharper and brighter image. Aperture is, in simple terms, diameter of its main, light-gathering objective. ![]() Most astronomers agree that aperture is the most important spec of a telescope, so this is the first thing you should look out for. These will help you finding a telescope that will suit your personal needs and also help you identify the price-quality-ratio. While some telescopes come with certain inconveniences, they might offer a better quality view with a bigger resolution for less money, for example.īesides knowing the different types of telescopes, you should be familiar with some of the more important features of a telescope. While it might be easy to dismiss all telescopes as inferior to Cassegrain telescopes, all of the different models and technologies have their own advantages and disadvantages. Models that fall into the Cassegrain telescope eliminate this problem, as well. The Newtonian telescopes offer the arguably best for amateurs, but note that some might find it weird to look an object in the sky from the side of the telescope. Reflecting telescopes use mirrors instead of lenses, which eliminates a lot of problems that refractor telescopes have. They offer a higher magnification, but come with a big disadvantage – image for the viewer is inverted, both in terms of left-right and up-down. A big improvement is the Keplerian telescope, with much wider field of view and greater eye relief. They have a somewhat distorted view and a narrow field of view, which makes them inconvenient for modern day practices. The most simple refractor telescopes are called Galilean telescopes. For the amateur astronomer, this is not a big problem, but glass is not the best material for massive telescopes because of lens sagging, the weight of glass and distortion of the pictures. The refractor telescope use a glass lens as their objective. Both types use an objective that collects light, but the main difference between these two telescope types is the kind of objective that is used. There are two basic types of telescopes that you can buy, namely refractors and reflectors. ![]()
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