SUNSET: 
67 results
An Observatory with Sails
After working at Sky & Telescope for nearly a decade I got the chance to build the observatory I'd always wanted.
A Pupil Primer: How Big Should a Telescope's Exit Pupil Be?
Image brightness, magnification, and why the old ideal of a 7-millimeter exit pupil is not so ideal at all.
A Scale of Seeing
Amateurs long have recorded the seeing quality in their observing logbooks on a rather subjective scale of 1 to 10, with 1 hopeless and 10 perfect.
Accurate Polar Alignment with Your Telescope
Long-exposure astrophotography requires an accurately aligned equatorial mount.
8 Backyard Observatory Mistakes to Avoid
Here are a few potential problems that you might not see on your blueprints.
Binocular Basics: Glossary of Binocular Terms
Exit pupils. Eye relief. Image stabilization. What matters most for astronomers? Our expert explains it all.
Collimation Tools
Three tools are commonly used to collimate Newtonian reflectors.
