What Is Collimation?

Collimation is the process of aligning the mirrors inside a reflector telescope so that light follows the correct path through the optical system.

Proper collimation ensures the sharpest possible images.

Which Telescopes Need Collimation?

Most reflector telescopes require occasional collimation, including:

  • Newtonian reflectors

  • Dobsonian telescopes

Refractors generally do not require user collimation.

How Often Is It Needed?

Many telescopes hold their alignment for months. Others may require checking after transportation or extended use.

Fortunately, collimation is usually quick and becomes easier with experience.

Signs Your Telescope Needs Collimation

  • Soft or blurry stars

  • Reduced planetary detail

  • Difficulty achieving sharp focus

Our Advice

Collimation may sound intimidating, but it's simply routine maintenance that helps your telescope perform at its best. Many astronomers learn the process in just a few minutes.