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- 30-50mm: Refers to small telescopes, suitable for beginners or for observing bright objects such as the Moon and planets.
- 51-70mm: Refers to medium telescopes for more detailed observation of planets and bright nebulae.
- 71-90mm: Refers to telescopes with greater light-gathering capability, ideal for astronomy enthusiasts and observing fainter celestial objects.
- 91-130mm: Refers to powerful telescopes for impressive observation of nebulae, constellations, and details on planets and the Moon.
- Over 130mm: Refers to advanced telescopes, suitable for serious amateur astronomers who want to observe faint objects and galaxies.
- Reflecting: They use a mirror to gather light. Then, with a secondary mirror at a 45-degree angle, they direct the light to the eyepiece.
- Dioptric: They use a lens that refracts light and focuses it onto a second lens called the eyepiece, which acts as a magnifier.
- Star Clusters & Large Nebulae: (Focal Length Range up to 700mm) Offers a wide field of view, ideal for observing large areas of the sky, such as nebulae and star clusters.
- Planets & Deep Sky Objects: (Focal Length Range 700-1300mm) Provides good magnification without losing much of the field of view. Suitable for medium-sized objects, e.g. individual star systems or planets with a relatively large surface area.
- Beginner: It refers to telescopes with an objective lens diameter smaller than 80 mm. These telescopes are usually compact, portable, and ideal for a beginner user.
- Familiar: Refers to telescopes with an objective lens diameter from 80mm to 185mm. These telescopes require more familiarity and are not suitable for a beginner user, but on the other hand, they are not sufficient to meet the needs of an experienced user.
- Experienced: Refers to telescopes with an objective lens diameter greater than 185 mm. These telescopes are usually bulky, heavy, and difficult to set up and align, so they are unsuitable for someone without advanced experience.
- Equator: Designed to "lock onto" stars, following their curved path across the sky. Although it requires a small adjustment at first, it allows you to track a star along an imaginary arc, moving only one lever without ever losing it.
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