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Every Telescope OS guide in one place, grouped by topic.
Telescope Guide
Learn the main telescope parts, how they work, and the basics to know before choosing or using one.
- How to Choose a 10-Inch Dobsonian Telescope
- What Is the Cheapest Smart Telescope?
- What Is the Most Powerful Portable Telescope?
- Which Telescope Brand Should You Choose?
- How Does a Newtonian Telescope Work? What to Know
- What Is a Primary Mirror on a Telescope?
- What Is a Secondary Mirror on a Telescope?
- What Is a Telescope Tube on a Telescope?
- Best App-Controlled Telescopes
- Best Astronomy Telescopes for Adults
- Best Celestron Telescopes Under $500
- Best Computer Controlled Telescopes with Cameras
- Best Long Focal Length Telescopes
- Best Portable Telescopes for Beginners
- Best Solar Telescopes for Beginners
- Best Telescopes for Beginners to See Planets
- Best Telescopes for Galaxy Astrophotography
- Best Telescopes for Solar Viewing
- Best Telescopes for Viewing Planets
- Best Telescopes for Viewing the Moon
- Best Telescopes for Wide-Field Astrophotography
- Best Telescopes for Young Kids
- Best Telescopes with a Wide Field of View
- Celestron StarSense Explorer vs AstroMaster: Which to Pick?
- Blue Marble NASA Lunar Telescope Review
- Celestron 114LCM Computerized Telescope Review
- DWARFLAB DWARF Mini Smart Telescope Review
- ZWO Seestar S30 Pro Review
- ZWO Seestar S50 Pro Review
Telescope Types
Compare common telescope designs and learn how each type gathers and focuses light.
- Which Type of Reflecting Telescope Should You Choose?
- Is a Refractor or Reflector Telescope Better?
- What Is a Dobsonian Telescope Design? What to Know
- What Is a Maksutov Cassegrain Telescope?
- What Is a Newtonian Telescope? A Simple Guide
- What Is a Reflecting Telescope? A Simple Guide
- What Is a Refracting Telescope? The Key Facts
- What Is a Ritchey Chretien Telescope? What to Know
- What Is a Schmidt Cassegrain Telescope? A Clear Answer
- What Is a Schmidt Newtonian Telescope? The Key Facts
- What Is a Triplet Apochromatic Refractor?
- What Is an Apochromatic Refractor? Quick Fixes
- What Is an Apochromatic Triplet? What to Know
- Best 150mm Reflector Telescopes
- Best 70mm Refractor Telescopes
- Best 80mm Refractor Telescopes
- Best Achromatic Refractor Telescopes
- Best Dobsonian Reflector Telescopes
- Best GoTo Telescopes
- Best Imaging Newtonian Telescopes
- Best Newtonian Reflector Telescopes
- Best Newtonian Telescopes
- Best Reflector Telescopes for Adults
- Best Refractor Telescopes for Adults
- Best Refractor Telescopes for Beginners
- Best Refractor Telescopes for Visual Astronomy
- Best Triplet Apochromatic Refractor Telescopes
- 8-Inch vs 10-Inch Dobsonian: Which Size Should You Choose?
- Dobsonian Telescope vs Newtonian Telescope
- Maksutov-Cassegrain vs Newtonian: Which Should You Choose?
- Schmidt-Cassegrain vs Newtonian Telescope
- SVBONY SV48P 102mm Telescope Review
Magnification And Viewing
Learn how telescope power and exit pupil affect image size, brightness, and comfortable viewing.
- How Do You Calculate Exit Pupil? A Simple Guide
- How Do You Calculate Telescope Magnification?
- How Does Exit Pupil Affect Image Brightness?
- How to Use a Telescope to See the Moon
- What Can You See Through a 10-Inch Dobsonian Telescope?
- What Can You See Through a 12-Inch Dobsonian Telescope?
- What Can You See Through an 8-Inch Dobsonian Telescope?
- What Can You See with a 70mm Telescope?
- What Does Saturn Look Like Through a Telescope?
- What Exit Pupil Is Too Small for the Eye?
- What Is Exit Pupil in a Telescope? Explained
- What Is Magnifying Power? A Simple Guide
- What Is Telescope Power? The Short Answer
- Best Telescopes for a Lunar Eclipse
Telescope Optics
Understand focal ratio, lenses, image flaws, and the tools used to improve telescope views.
- What Focal Length Is Best for Astrophotography?
- Can a Schmidt-Newtonian Use an SCT Corrector Plate?
- How Do Solar Telescopes Work?
- How to Calculate Telescope Focal Length
- How to Collimate a Newtonian or Dobsonian Telescope
- How to Use a Telescope Field of View Calculator
- What Does F-number Mean in Astronomy? Explained
- What Is a Coma Corrector for a Telescope?
- What Is a Fast Focal Ratio Telescope? Explained
- What Is a Field Flattener for a Telescope?
- What Is a Slow Focal Ratio Telescope? Explained
- What Is an Aberration in Telescope Optics?
- What Is an Achromatic Lens in a Telescope?
- What Is Chromatic Aberration in a Telescope?
- What Is Coma in a Telescope? The Technical Answer
- What Is Field Curvature in Telescope Optics?
- What Is Spherical Aberration in a Telescope?
- What Is Telescope Focal Length?
- Best Telescopes with Glass Lenses
- Telescope vs Microscope: Which Do You Need?
Aperture And Resolution
Learn how aperture and optical limits affect detail, resolution, and what a telescope can show.
- How Do You Measure a Telescope Aperture?
- What Is Angular Resolution Formula? A Simple Guide
- What Is Angular Resolution in Astronomy?
- What Is Diffraction Limited Optics? A Simple Guide
- What Is Resolving Power in a Telescope? Explained
- What Is the Airy Disk in Telescope Optics?
- What Is the Rayleigh Criterion? A Simple Guide
- What Is the Resolving Power Formula? A Simple Guide
- What Unit Is Telescope Aperture Measured in?
- Best 150mm Aperture Telescopes
- Best 90mm Aperture Telescopes
- Best Celestron CPC Telescopes