These telescopes can be divided into two different types: Newtonians and Dobsonians. Newtonian reflectors are quite versatile and well-suited to astrophotography, but they require quite a lot of ...

Standing on shoulders Both types of telescopes—Galileo's refractor and Newton's reflector—underwent improvements in the coming centuries. Designers of refracting telescopes figured out ...

Newtonian telescopes use a reflecting mirror to avoid the colour distortion and rainbow effect afflicting telescopes that use lenses. Finally, Newton discovered and defined calculus, the ...