Refractors have a lens made of lenses, especially the achromatic refractor is the most popular model and has two lenses.
This optical scheme has proved popular with amateur and professional astronomers.
This is due to several advantages:
-mechanical simplicity, reliability and ease of use and reliability.
-Low maintenance-
provides images with better contrast especially to the Moon, planets and multiple star Optical Tube
-closed to protect the optics and to reduce internal turbulence.
In the next issue will be the Newtonian reflector telescopes.
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