
How to Calculate Telescope Magnification
Learn how to calculate telescope magnification, compare eyepiece and Barlow combinations, and choose useful power for clear views of the Moon, planets, and stars.
Set up, align, collimate and connect your telescope, plus eyepieces, finders, filters and phone adapters.

Learn how to calculate telescope magnification, compare eyepiece and Barlow combinations, and choose useful power for clear views of the Moon, planets, and stars.

Learn how to collimate a Newtonian telescope by checking the secondary and primary mirrors, making small adjustments, and confirming alignment before observing.

Learn how to connect a telescope to a computer by USB, WiFi, or camera. Check mount compatibility, choose software, set up the connection, and fix common problems.

Learn how to set up a telescope for the first time, attach the mount and finder, align the finder, choose an eyepiece, and focus on a clear target.

Learn how telescope eyepiece focal lengths, magnification, field of view, and fit affect your view, then choose a practical first eyepiece or set.

Compare telescope phone adapters by eyepiece fit, phone size, alignment controls, and shutter options, then set up your phone for clearer telescope photos.

Choose and align a telescope red dot finder with clear setup steps, practical buying advice, night-use tips, and fixes for common aiming problems.

Why is my telescope image upside down? Learn how telescope optics and diagonals change image orientation, when it matters, and how to correct it.