Magnification Explained

Magnification is often one of the first specifications people notice when buying a telescope, but it's also one of the most misunderstood.

Contrary to popular belief, higher magnification does not automatically mean better views.

How Is Magnification Calculated?

Magnification is determined by dividing the telescope's focal length by the eyepiece focal length.

For example:

  • Telescope focal length: 1000mm

  • Eyepiece: 20mm

Magnification = 50x

Why More Isn't Always Better

As magnification increases:

  • Images become dimmer

  • Small vibrations become more noticeable

  • Atmospheric turbulence affects image quality

  • Detail can actually become harder to see

Every telescope has a practical limit based on its aperture and optical quality.

The Importance of Image Quality

A sharp image at 80x is far more enjoyable than a blurry image at 400x.

Many inexpensive telescopes advertise extremely high magnification figures, but these are often unrealistic in everyday observing conditions.

Our Advice

Choose your telescope based on optical quality and aperture rather than advertised magnification. Quality optics will always outperform excessive magnification.