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Field Guide / Optics

Reflector Telescope

Also called: Newtonian, mirror telescope

A telescope that uses a mirror at the back to gather light. It gives the most aperture for the price.

Simplified labeled diagram: Reflector Telescope
Simplified diagram, not to scale. Real products vary by maker, and the drawing does not show any one model.
Type
Telescopes
Typical apertures
114 to 200 mm for common models
Design
Open tube with a primary mirror at the back and a small flat mirror near the front
Upkeep
The mirrors may need occasional alignment (collimation)
Used for
Stargazing

Safety: Never point a telescope, finder, or any other optic at the Sun without a certified solar filter made for it. Even a glance can cause permanent eye damage.

What it is good for

  • Faint objects such as galaxies and nebulae from dark skies.
  • Budget buyers who want large aperture.
  • People who like to tinker.

Where it falls short

  • Needs collimation from time to time.
  • The open tube lets in dust and air currents.
  • Bulkier than a refractor of the same aperture.

Tips

  • Let the telescope cool outdoors for 20 to 30 minutes before observing.

Works well with

Field notes

A mirror collects light across a wide surface without the glass cost of a large lens, which is why reflectors are good value.

Related guides

Specs here are typical, not guarantees; models differ, so check the maker's published numbers. Never look at the Sun through any optic without a certified solar filter, and zero or mount a scope with the firearm unloaded and pointed in a safe direction. Rules on optics, such as scopes on certain hunts or lasers and electronics, differ by state; our state resources directory links to each state's official regulations. Want a buying guide? Read Choosing Hunting Optics.

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