So far in this series I have discussed about the basics of telescopes. The second post of this series pointed out the differences between reflectors and refractors. I came across with “truemartian” in YouTube. He has uploaded pretty good videos of the basics of telescopes in YouTube, such as this one discussing about the differences between reflectors and refractors. In order to understand more about reflectors and refractors, check out this video from “truemartian”. He explains clearly the differenrec between those two types of telescopes and he shows a couple of real telescopes.