This event has passed. It took place on Tuesday, December 16, 2025. See Upcoming Events

Astronomy Fundamentals

Past Event Public

Core Concepts About Telescopes

Presenter: Drew Carhart

No piece of equipment is more central to our stargazing hobby than the telescope. Many telescope users have discovered that they get a lot more satisfaction out of their ‘scopes if, instead of thinking of their telescope as a magical device that somehow shows them the heavens, they gain a basic understanding of how the telescope does what it does.
For the December 16th Astronomy Fundamentals program, long-time member and telescope user & designer Drew Carhart will provide a genuinely fundamental overview of telescope basics. Have you had trouble conceptualizing why f-number is sometimes more important than objective diameter? What the mm number on an eyepiece means? What the heck an exit pupil actually is? Or how different — or similar — a refractor is from a catadioptric telescope? Drew will touch on these concepts and more.

This event is open to the public and free of charge.

Location

Grace United Methodist Church: Room 254

300 E. Gartner Rd. Naperville, IL 60540

Room 254
Park in the upper, north lot for this meeting, and enter at the far-left door as you are facing the building. This door is marked as “Activity Center”. The door will be on a timer, just like the entrance to Fellowship Hall.