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Field Guide / Optics

Compound Telescope

Also called: Schmidt-Cassegrain, Maksutov, catadioptric

A compact telescope that folds the light path using both mirrors and a lens. Many models include a motorized mount.

Simplified labeled diagram: Compound Telescope
Simplified diagram, not to scale. Real products vary by maker, and the drawing does not show any one model.
Type
Telescopes
Typical apertures
90 to 280 mm
Tube length
Short for its focal length
Mounts
Often computerized GoTo mounts
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

  • Travel and storage, thanks to the short tube.
  • Planets and the Moon at high power.
  • People who like computerized pointing.

Where it falls short

  • Costs more per inch of aperture than a Dobsonian.
  • A sealed front corrector plate can fog or dew over without a shield.
  • Computerized mounts need power and setup.

Tips

  • Use a dew shield on humid nights.

Works well with

Field notes

Folding the light path makes a long focal length fit into a short tube, which helps with magnification and portability.

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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