Updated: Aug 18, 2021
The best telescope is the one you will use the most
Your kids are showing a lot of interest in astronomy and stargazing. You think that a telescope could help grow their curiosity and ignite their passion for science and technology. Unfortunately, there are many choices in the market, which can make finding the right telescope very confusing.
How much should I spend?
What objects am I going to be able to see?
Will it be easy to use for my kids or even for myself?
How easy will be to find planets and deep-sky objects, like galaxies, nebulae, or globular clusters?
How much space will take at home when I am not using it?
Will it fit in my car when I go camping?
I’m going to provide some directions to identify the most suitable telescope for you and/or your kids. Before getting into many details, you should know that the best telescope is the one you will use the most.
Observing the Moon and the planets
If you want to see the Moon and the planets, a small refractor will reveal a nice image of the craters of the Moon and some details of Jupiter and Saturn. If you have more budget, you may want to consider a larger refractor or a compact catadioptric like a Maksutov-Cassegrain or a Schmidt-Cassegrain. Those telescopes are more expensive and can deliver a much higher magnification, which makes them ideal for solar system observation.
Be aware that the maximum magnification that you should consider is 2 times the diameter of the telescope aperture in mm. For example, a telescope with 90mm of the aperture will deliver a magnification of x180. Very cheap telescopes are usually advertised by really high magnification rather than by the aperture. Stay away from those telescopes!
Observing Deep Sky Objects
Planets and the Moon are very cool, but soon you and your kids will get bored of observing just a few objects. The next natural step will be to explore a list of Deep Sky Objects (DSO), which is almost endless. My recommendation for DSO (and also suitable for observing planets) is to consider a Newtonian telescope with at least 150mm of aperture, ideally 250mm. If you have more budget, you can consider a catadioptric like a 180mm Maksutov-Newtonian or a 250mm Schmidt-Cassegrain with a focal reducer.
Ideal telescope mounts for beginners
The ideal telescope mount for a beginner is alt-azimuth. That is because the eyepiece always stays in a comfortable position. With an equatorial mount, the eyepiece’s position can be challenging, especially for a Newtonian telescope. Equatorial mounts are mandatory for astrophotography and, from my point of view, are not the best option for beginners.
The most popular type of alt-azimuth mount is Dobson because it is cheap and easy to manage, even for a kid. Unfortunately, a Newtonian telescope with a Dobson mount (a.k.a. Dobsonian) can be quite heavy and bulky. The 250mm Dobson telescope I use in the Stargazing Labs can be used by ~9 years old kid but is around 30kg weight. If you go bigger than that, you probably need two people to move it; otherwise, you will need to spend some more time working out in the gym.
Computerized telescopes can help a lot to find objects, especially in highly polluted areas. Having this feature will increase the cost quite a bit.
Are you looking for something small?
If you are looking for something small that can fit in a backpack or a small car when you go camping, you should consider using binoculars with a tripod. I recommend 7x50 binoculars as a cheap option, or if you have more budget, consider bigger apertures like 20x80 or 25X100.
Additional cheap accessories to be considered
The mirrors of the telescope need to be well aligned to deliver a high-quality image. If you end up with a Newton telescope, you should consider buying a Cheshire eyepiece. Single beam laser collimators are relatively affordable and easy to use. Unfortunately, they can not help correct the off-axis position of the secondary mirror or ensure the collimation of both mirrors’ surfaces. While the laser collimator helps speed up the process, to ensure the perfect collimation between the two mirrors, a Cheshire is always required. If your main mirror has no central spot, you should consider getting a mirror spotting template and center spots stickers.
The Maksutov-Cassegrain and Schmidt-Cassegrain telescopes can be collimated with a bright star or using an inexpensive tri-Bahtinov mask.
Light pollution filters
These filters try to reduce as much as possible the artificial light coming from the city. While those filters are transparent for a wide range of the spectrum, it blocks certain particular regions of well known artificial light bulbs. Knowing the dominant light pollution in your city will help you choose the right filter to save time and money.
I highly recommend the Ultra-High Contrast filter, which allows the transmission of nearly 100% of the radiation from both O-III and the H beta lines. All annoying, scattered light from other wavelength sources, including local artificial light pollution, is filtered out. With this strong blocking of the sky, a great detail becomes visible for gas nebulae and planetary nebulae.
UHC-E variant increases the contrast of emission nebulae and also comets. It’s recommended for observation of emission nebulae and comets with small telescopes under light-polluted skies.
Neutral density filter
Most probably, your new telescope will also come with a not very useful Moon filter. I strongly recommend getting a neutral density filter (0.8, 0.9). That reduces the bright glare of the Moon and reveals highly lunar detail and surface features.
Use multiple finderscopes
Until you are very familiar with the night sky, you can lose many hours trying to find a particular object. Nothing is more frustrating than a star cluster, a nebula, or a galaxy that you want to look at but simply cannot find. The red dot, laser pointer, or projector finders can help to reduce this frustration. These types of finders in combination with a regular finderscope will help you to get success. If you don't want to drill new holes in your telescope to incorporate a new finderscope, consider getting a