Popular Articles

How to Determine Which Eyepieces to Use with Your Telescope
SCT & EdgeHD Collimation Guide
Aligning Your Celestron Finderscope: A Step-by-Step Guide
Why is my Telescope Showing Everything Upside Down? Is There Something Wrong with it?
Which scope aperture is best for different kinds of objects?
Close Focus Distance in Binoculars: A Comprehensive Guide

Close Focus Distance in Binoculars: A Comprehensive Guide

If you’re an avid birdwatcher, a nature enthusiast, or just someone who enjoys clear, crisp views through binoculars, understanding close focus distance (sometimes called near focus distance) is es...

Close Focus Distance in Binoculars: A Comprehensive Guide

If you’re an avid birdwatcher, a nature enthusiast, or just someone who enjoys clear, crisp views through binoculars, understanding close focus distance (sometimes called near focus distance) is es...

What is the difference between roof prism and Porro prism binoculars?

What is the difference between roof prism and Porro prism binoculars?

A prism is a transparent glass optical element with flat, polished surfaces positioned at that refract light. The purpose of prisms is to give you an upright image; they are...

What is the difference between roof prism and Porro prism binoculars?

A prism is a transparent glass optical element with flat, polished surfaces positioned at that refract light. The purpose of prisms is to give you an upright image; they are...

What are the types of optical design aberrations?

Aberrations are defects in images produced by a telescope (or optical system). They are caused by limitations in the design and manufacture of the optics. In theory, a perfect scope...

What are the types of optical design aberrations?

Aberrations are defects in images produced by a telescope (or optical system). They are caused by limitations in the design and manufacture of the optics. In theory, a perfect scope...

What is seeing? What is transparency of the atmosphere?

"Seeing" is the term astronomers use to describe the sky's atmospheric steadiness. Transparency is used to describe atmospheric clarity.The atmosphere is in continual motion with chan...

What is seeing? What is transparency of the atmosphere?

"Seeing" is the term astronomers use to describe the sky's atmospheric steadiness. Transparency is used to describe atmospheric clarity.The atmosphere is in continual motion with changing temperatu...

What is collimation?

Collimation is the proper alignment of the optical elements in a telescope, which is critical for achieving optimum results. Poor collimation will result in optical aberrations and distorted images...

What is collimation?

Collimation is the proper alignment of the optical elements in a telescope, which is critical for achieving optimum results. Poor collimation will result in optical aberrations and distorted images...

Other Polar alignment tips.

You can use your finderscope (finder) to accurately polar-align your equatorial mount. This is more accurate than a rough alignment using the mechanical scales on your mount or roughly pointing...

Other Polar alignment tips.

You can use your finderscope (finder) to accurately polar-align your equatorial mount. This is more accurate than a rough alignment using the mechanical scales on your mount or roughly pointing...