TYPES OF TELESCOPES
In these devices, the images of stars are created by the primary concave mirror and auxiliary convex or flat mirrors. Refractors are divided into achromats, the so-called ED-refractors, and apochromats. The main problem with refractors is a chromatic aberration, which leaves color halos above the observed objects, which reduces the sharpness and contrast of the image. However, with this distortion, you can successfully fight, accurately calculating the lens parameters, the lens rim and the air gap between the lenses, and also using low-dispersed glass and new optical circuits. The recommended objects of observation are the Moon, planets, and ground objects.
- The simplicity of design.
- Resistance to mechanical influences and weather conditions.
- Clear and contrast image.
- Low light scattering.
- It does not need any special maintenance.
- The limited maximum diameter of the lens (up to 150 mm).
- It is expensive.
In the reflector telescopes, a concave mirror appears in the lens, which collects the light into a focus like a refractor lens. The light is reflected and gathered into focus by the primary mirror. The recommended subjects of observation are galaxies, nebulae, and other objects of deep space. The reflector is perfect for observing the city.
- Compact design.
- Affordable price
- The largest diameter of the lens.
- Sensitivity to mechanical influences, temperature changes, and wind fluctuations.
- Large light dispersion.
- Complicated maintenance.
Catadioptric models combine the characteristics of the previous types. The lens is a combination of a lens and a mirror. The recommended subjects of observation are the planets, the moon, stars, galaxies, and nebulae.
- Compact design.
- No distortion.
- Closed design.
- Relative cheap price
- The low contrast of the image.
- Strong light absorption.
- Complex construction.
TELESCOPE BUYING GUIDE – WHAT TO LOOK AT?
Choosing the best telescope, you need to soberly assess the housing conditions and opportunities to allocate space under the observation platform or the ability to transport the device to a remote location. Suffice it to say that you need to define your observational preferences and, based on the budget, analyze the suitable models of the best telescope for beginners, offered by the sellers of solar equipment.
Having thoroughly approached this question and made the right choice, the best telescope will give you many bright and beautiful impressions from the observations of the starry sky. So, if you are looking for the best telescope to buy to see planets, keep in mind the advice below.
The main parameter that determines the characteristics and power of the best telescope is its diameter, the aperture. The larger the lens, the more light from distant objects it will be possible to assemble in focus. A large aperture of the best quality telescope also gives a larger angular resolution, allowing you to observe more subtle details of celestial objects.
#2 Focal Length
The focal length is a segment on the optical axis, which is equal to the distance from the lens to the focal plane of the telescope in which the lens has constructed the image. Also, the relative aperture is the ratio between the focal length of the lens and its diameter.
The focus and the luminous intensity of the best astronomical telescope play a significant role as for the quality of the images. In most cases, top telescopes with a smaller relative aperture and a broader focus are more advantageous for visual observations.
#3 Maximum Useful Magnification
The focal length and the eyepiece determine the maximum useful magnification. This parameter can be changed by setting different eyepieces into the space telescope. The maximum useful magnification is the limiting value at which an image of acceptable quality can be obtained. Based on the best telescope reviews, its excess will lead to deterioration in the clarity of the picture.
The more significant is the sight, the higher is the sky region visible in the infrared telescope, but the smaller are the objects. A great view makes it easier to find the desired object by coordinates.
Convenient mounting (or mechanical fastening of the pipe) is also essential when choosing the best telescope. The most suitable type of mount is the equatorial one, allowing rotation around only one axis to compensate for the rotation of the Earth. There are still azimuth mounts that require simultaneous rotation of the device along two axes – vertical and horizontal. This type of mounting is convenient only if there is computer control or when observing ground objects.
THE BEST TELESCOPE 2020 FINAL ADVICE
It’s high time to tell you what the best telescope of 2020 is. Thus, Celestron 127EQ PowerSeeker is the best telescope based on various characteristics. In a rather dark area, with this best telescope, you can see most of the objects from the Messier catalog, as well as Jupiter, its Great Red Spot, magnificent views of the Moon. This tool can fit any budget, has a stable and reliable construction, and can be useful to beginning astronomers, as a universal tool. With a reasonably small aperture, this best telescope in the world can solve quite serious problems. Based on telescope reviews, this model can serve as a solid base for further observations of near and far outer space on more professional instruments.