Knowledge Base
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The Ultimate Guide to Observing Venus
Between Earth and the Sun orbits Venus—our brilliant sister planet, cloaked in clouds and steeped in mystery. Venus regularly dazzles observers with its stunning white glow as the “Morning Star”...
The Ultimate Guide to Observing Venus
Between Earth and the Sun orbits Venus—our brilliant sister planet, cloaked in clouds and steeped in mystery. Venus regularly dazzles observers with its stunning white glow as the “Morning Star”...
How to Determine Which Eyepieces to Use with Your Telescope
Every scope Celestron manufactures includes the following information in its specifications chart: the minimum useful magnification and the maximum useful magnification. This information provides t...
How to Determine Which Eyepieces to Use with Your Telescope
Every scope Celestron manufactures includes the following information in its specifications chart: the minimum useful magnification and the maximum useful magnification. This information provides t...
The Ultimate Guide to Observing Mercury
Fast and fleeting Mercury—the closest planet to the Sun—races through the sky like the winged messenger of the gods for which it is named. Despite being one of the least...
The Ultimate Guide to Observing Mercury
Fast and fleeting Mercury—the closest planet to the Sun—races through the sky like the winged messenger of the gods for which it is named. Despite being one of the least...
What is the difference between BaK-4, BK-7 and K9 glass?
There are literally thousands of different formulations of glass in the world. Each formulation has its own very specific optical properties and consequently its own designation. BK-7 and Bak-4 are...
What is the difference between BaK-4, BK-7 and K9 glass?
There are literally thousands of different formulations of glass in the world. Each formulation has its own very specific optical properties and consequently its own designation. BK-7 and Bak-4 are...
Astronomy Glossary of Terms
ABCDEFGHIJK LMNOPQR STUVWXYZA Aberration – defects in images produced by a telescope (or optical system). They are caused by limitations in the design and manufacture of the optics. Find out...
Astronomy Glossary of Terms
ABCDEFGHIJK LMNOPQR STUVWXYZA Aberration – defects in images produced by a telescope (or optical system). They are caused by limitations in the design and manufacture of the optics. Find out...
What are the different eyepiece sizes/diameters?
Astronomical eyepieces are described by the diameter of the base tube or barrel and come in several standard diameters. This is not to be confused with the focal length of...
What are the different eyepiece sizes/diameters?
Astronomical eyepieces are described by the diameter of the base tube or barrel and come in several standard diameters. This is not to be confused with the focal length of...