To learn more about magnification, try out our calculator, or check out this article for more in-depth coverage on it. A telescope with a focal ratio of f/5 is excellent for this viewing. Meanwhile, if you want to have a wider view of galaxies and star groups, you need to choose a scope with a lower focal ratio – wider field of view and lower magnification. A telescope with a focal ratio f/10 is suitable for this. For excellent viewing of the planets and the moon, you need to have a high focal ratio, that is a smaller field of view and high magnification. Focal ratio is the result for dividing the focal length by aperture of the objective lens or mirror. On the other hand, for deep space objects, and for the same price, a 150 mm Newtonian scope is better compared to an 80 mm Refractor.įocal ratio is also an essential factor to consider for the type of objects to be viewed. An 80 mm refractor with high-quality optics is better than 150 mm reflector with low-quality optics for viewing the moon and the planets. The larger the aperture, the more light that is focused toward your view, thus giving more significant details of an object.īetter quality optics are more important than having a large aperture. The aperture affects the amount of light collected from the object. In terms of aperture, an excellent telescope for beginners must have an aperture size above 70mm, preferably, between 80 mm (3.15″) to 300 mm (12″). Typically, choosing a scope with a focal ratio above f/8 is referred to as “slow” scope. Telescopes with high focal ratio are called “slow” telescopes, meaning they have longer focal lengths. You can learn more about Cassegrain’s by clicking here.Ĭassegrains are a “slow” telescope which is more preferred when viewing the planets. The best telescope for planet observing is a Cassegrain style telescope. Telescopes gain an advantage over binoculars because to start and see planets with detail, you start needing bigger apertures and more magnification. However, if you really want to study planets, this is where it starts to get more complicated. Click here to see how recommended stuff page. And just the curious beginner can get more bang for their buck with good binoculars. Observing the moon and planets in our Solar System, they emit enough brightness already, so aperture diameter will be of lesser emphasis for this field of observing. There are different telescope requirements for each object to have a perfect view of them. Here, we are going to have a more in-depth discussion about the three things.įield of study (moon, planets, or deep space objects)įor an amateur astronomer, you have three choices for your first observational astronomy, that is, the moon, solar system planets, and deep space objects. In general, you need to consider three main factors – price, celestial targets, and telescope specifications.īefore buying your first telescope, know first the three crucial factors you need to consider – field of study, price tag, and the place and procedure of using it. Rather, if it is for yourself, or as a gift to someone. Knowing your desired celestial targets is a big plus for determining which telescope is best.Ĭhoosing observational astronomy as a hobby is an excellent decision, and picking the best telescope for that hobby can be challenging. Typically the best telescope for a beginner is based on ease of setup, ease of use, and purchase price.
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