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 ...

To combat this, manufacturers offer various Newtonian coma correctors, designed to alleviate (to varying degrees) this ...