It is recognized as a long tube that increases in length until it gets to the lens. This lens requires special crafting, which is why they are so expensive.

Are expensive telescopes worth it?

Most telescopes that cost less than $300 aren't really worth it. ... A telescope's most important attribute is its size, meaning the diameter of its main mirror or lens. The bigger the telescope, the more light it collects, which allows you to see dimmer objects. A popular first telescope is a Dobsonian.

How much would a good telescope cost?

While you can find some worthwhile telescopes under $200, most good telescopes cost anywhere from $300 right up to $20,000 USD! The price you pay for a telescope is dependent on many factors including the type of telescope, quality of mirror and glass coatings, aperture size, technology and included accessories.