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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?
What is the field of view of a pair of binoculars?

What is the field of view of a pair of binoculars?

Your binoculars' field of view is the width of the area you can see. It’s usually described in two ways: angular field of view and linear field of view.Angular field...

What is the field of view of a pair of binoculars?

Your binoculars' field of view is the width of the area you can see. It’s usually described in two ways: angular field of view and linear field of view.Angular field...

How do I get my Celestron digital USB microscope to work with my Mac?

1. You will need a Mac running OS 10.4.9 (Tiger) or higher. Your Mac will automatically recognize the microscope, so you won't need to use the included CD (which only...

How do I get my Celestron digital USB microscope to work with my Mac?

1. You will need a Mac running OS 10.4.9 (Tiger) or higher. Your Mac will automatically recognize the microscope, so you won't need to use the included CD (which only...

How much magnification can I use with my CPC scope, and how much is too ...

A telescope's magnification is actually a relationship between two independent optical systems–the telescope itself and the eyepiece you are using. To determine power, divide the focal length o...

How much magnification can I use with my CPC scope, and how much is too ...

A telescope's magnification is actually a relationship between two independent optical systems–the telescope itself and the eyepiece you are using. To determine power, divide the focal length of th...

I want to use my spotting scope to take pictures. What’s its f-number?

The f-number or focal ratio is just the focal length of the spotting scope divided by the aperture (diameter of the lens). It’s almost universally given as a quantity like...

I want to use my spotting scope to take pictures. What’s its f-number?

The f-number or focal ratio is just the focal length of the spotting scope divided by the aperture (diameter of the lens). It’s almost universally given as a quantity like...

How does a microscope get light to the specimen? What do I need to know ...

The lowest-powered microscopes may not need any light other than that provided from room lighting or the sky. However, the microscope may be so close to the specimen that the...

How does a microscope get light to the specimen? What do I need to know ...

The lowest-powered microscopes may not need any light other than that provided from room lighting or the sky. However, the microscope may be so close to the specimen that the...

What do aplanatic optics do?

Aplanatic optics are designed to eliminate both spherical aberration and coma, two major aberrations (image defects) found in telescopes. The end result is sharper images across a much wider field...

What do aplanatic optics do?

Aplanatic optics are designed to eliminate both spherical aberration and coma, two major aberrations (image defects) found in telescopes. The end result is sharper images across a much wider field...