Editing Newtonian telescope (section)

===Advantages of the Newtonian design===
* They are free of [[chromatic aberration]] found in refracting telescopes.
* Newtonian telescopes are usually less expensive for any given objective diameter (or [[aperture]]) than comparable quality telescopes of other types.
* Since there is only one surface that needs to be ground and polished into a complex shape, overall fabrication is much simpler than other telescope designs ([[Gregorian telescope|Gregorians]], [[Cassegrain reflector|cassegrains]], and early refractors had two surfaces that need [[figuring]]. Later [[Achromatic lens|achromatic]] refractor objectives had four surfaces that have to be figured).
* A short [[focal ratio]] can be more easily obtained, leading to a wider [[Field of view#Astronomy|field of view]].
* The eyepiece is located at the top end of the telescope. Combined with short f-[[ratios]] this can allow for a much more compact mounting system, reducing cost and adding to portability.