Every telescope photographer wants to have a good telescope, but with the wide use of telescopes, the demand for telescopes is increasing, so the number of telescope suppliers is also increasing.  At present, there are a variety of telescopes on the market, and the quality of the telescope is uneven, and for the novice telescope photographer, little knowledge of the telescope, do not know how to buy a good telescope.  So I’m here to share with you what are the factors that affect telescope performance? To help you buy a good telescope.  

What are the factors that affect telescope performance?

1. Objective aperture  

The objective aperture of a telescope is generally referred to as the effective aperture, also known as the through-light diameter, which represents the telescope’s ability to collect light.  The telescope’s objective aperture directly determines its ability to collect light intensity.  With other indexes unchanged, the larger the aperture of the objective lens, the larger the area of receiving light, and the darker objects can be seen.  Or in the long exposure process, you can shorten the exposure time.  That is, the larger the lens, the more light enters the telescope and the brighter the image.  

2. The focal length  

The ratio of focal length to the aperture is equivalent to the aperture on a camera lens.  If the aperture is unchanged, the longer the focal length of the objective lens, the larger the focal ratio, the higher the multiplier is easy to get;  The shorter the focal length of the objective lens, the smaller the focal ratio, it is not easy to get higher magnification, but the image is brighter, the field of view is larger.  Choose a telescope with a large aperture depending on your financial ability.  

3. The coating  

If you pay attention to the telescope, you will find that the objective surface of the telescope presents different colors: red, blue, green, yellow, purple, and so on, which is commonly known as a coating.  Without coating, 50% of the light passing through the objective lens will be diffuse and will not reach your eyes, and cause a foggy phenomenon!  The role of telescope lens coating is to prevent light reflected in the lens above the diffuse light caused by mist like whiteness, increase the transmittance, increase the color contrast, vividness, color reduction, improve the observation effect.  The more general coating layer, the deeper, the thicker, the better the viewing effect, the higher the brightness.  The coating color depends on the optical material and design requirements of the lens.  In normal use, blue film, green film are more excellent.  

4. View  

The field of view is the range of objects we observe.  This number refers to the range seen at a distance of 1,000 meters.  The larger the field of view, the larger the telescope can see.  

5. Material  

To reduce the cost, the most common telescopes on the market are made of plastic bodies and tubes. Only a few advanced products and military types are made of all-metal structures, which are expensive, but their durability is unmatched.  

6. Is it easy to carry  

For the telescope, you buy, be sure to consider whether it is portable.  If you buy a telescope that’s big and bulky, it’s hard to take it out and take pictures, so you buy it and you don’t use it, and you’re buying junk.  

Take a look at these six factors that can affect the performance of your telescope and help you choose the right telescope for you.  

FAQ:

What are the factors that may affect the magnification abilities of a telescope?

Magnification depends upon the focal length of the objective lens or primary mirror and the focal length of the eyepiece. Generally, long focal length telescopes are capable of delivering higher magnifications than short focal lengths.

Why are telescopes used?

telescope, a device used to form magnified images of distant objects. The telescope is undoubtedly the most important investigative tool in astronomy. It provides a means of collecting and analyzing radiation from celestial objects, even those in the far reaches of the universe.

What determines the power of a telescope?

To determine power, divide the focal length of the telescope (in mm) by the focal length of the eyepiece (in mm). By exchanging an eyepiece of one focal length for another, you can increase or decrease the power of the telescope.