130MM Telescope: What Can You See?

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Telescopes are available in various apertures, focal lengths, and designs. The technical features and figures might be confusing at first, and it can be difficult to know exactly what you will get if you decide to buy one.

130mm telescopes are among the most popular versions because they balance great power and inexpensive price.

As a result, we decided to provide a guide on what to anticipate from a device in this aperture range. Find out How to Reduce the Resonant Frequency of the 3rd Harmonic on 40 Meter Band Wire? And How to Reduce the Resonant Frequency of the 3rd Harmonic on 40 Meter Band Wire?

We will also examine 127mm telescopes in this category for practical purposes, as they are almost identical.

The tiny variation is because US producers utilize a round figure of 5 inches in their telescopes, which converts to 127mm, while European and Asian producers that use the metric system round them up to 130mm to use a round figure. They perform equally in terms of results. Thus we’ll put them alongside.

What exactly does “130mm” mean?

The integer in the name of a telescope relates to its aperture. The diameter of a front convex lens is referred to as the aperture.

This is the most critical component of a telescope since it is the lens that will catch the light. Learn How to Have a Successful Portal QRP Operation?

Although most producers utilize metric units, the “mm” stands for millimeters. 130mm equals 5.11 inches, although, as previously stated, several firms also produce 127mm telescopes that are exactly five inches long.

Types Of 130mm Telescopes: Cassegrain Vs. Reflectors Vs. Refractors

When it comes to choosing between various types of telescopes, this aperture category provides the most alternatives.

There are refractors, Newtonians, Cassegrains, and sometimes even a few tabletop Dobsonians. Check out this link for How to Get on the 220 MHz Band Without Spending a Lot?

Our advice is to swiftly abandon refractor telescopes of this size, not for quality reasons (they look beautiful), but because this is the price range when they become prohibitively costly.

The price of refractors scales exponentially due to the design of the lenses. Therefore they become very costly very quickly.

As a result, you’ll usually encounter refractors in the 60mm-110mm range. Unless you have extremely particular reasons for wanting a refractor, opt for something else.

There are even several tabletop Dobsonians available. The optics are adequate, but their movement and adaptability are limited due to the lack of a tripod.

Again, unless you explicitly want a telescope for indoor usage solely, we recommend avoiding those. Here is How to Deal with Power Line Noise in The City?

This leaves reflectors (or Newtonians) and various Cassegrains. These are both good choices, and you may decide based on your pricing or demands. We’ll make a few suggestions below.


  • Whenever it comes to optics, the price-to-value ratio is outstanding. Including the 150mm scopes, this is perhaps the best aperture spectrum
  • There are several models, brands, and styles to pick from
  • Still light enough to take on a journey but approaching the practical limit


  • Newtonians and Cassegrains have a steeper learning curve. As previously stated, refractors are not the ideal choice for this aperture
  • They begin to gain weight
  • It is no longer safe for tiny children to use without adult supervision

What Can You Anticipate From Them?

Several variables influence what items you can see, how far away you can see them, and the image quality you will receive. Check out Phased Arrays in Ham Radios: All You Need To Know and Parasitic Arrays in HAM Radio: All You Need to Know.

It is determined not just by the telescope’s aperture but also by its focal length, the lens in use, and the atmospheric and geographical circumstances.

Still, we’ll attempt to generalize a little to give you a sense of what kind of pictures and objects you may expect from a 5-inch / 130mm telescope.


A 130mm telescope is more than adequate for observing all of the planets in the Solar System. Click the link to learn How to Develop a Simple Pull-Up Mono-Band Vertical Dipole Antenna

For these telescopes, Mars is a good target. You will be able to identify its poles and distinct hues, and depending on how near it is to Earth, you may be able to discern the key geological characteristics.

With its many hues and tones, Jupiter is likewise a fantastic display. You should be able to glimpse its bigger moons, like Ganymede, if the conditions are favorable.

Saturn is the planet where you can detect the difference between a telescope of this size and a smaller one because you can start to distinguish the features and separation in its rings.

The moons of Saturn are too tiny to be seen most of the time, but given ideal conditions, you might be able to see them.

Neptune and Uranus will be visible, but they will appear as pale blue specks with no discernible hues or characteristics.

Pluto is beyond the purview of these telescopes. You’ll need ideal conditions to see it, and recognizing it is challenging because it appears like a dot.