Questar Corporation: Information from the company who makes these fine telescopes. Some useful documents on the company's website include:
- Questar History.
- Questar Serial Number Systems: Includes a fairly extensive timeline.
- Eyepieces Used By Questar.
- 3.5 Inch Image Shift (Wobble) Information.
Questar booklets on TELESCOPE::Classics.
Questar Zone: Ben Langlotz's YouTube channel filled with many useful videos.
The Questar Telescope: Robert Pettengill's Questar page.
Ralph Foss: Information about Questar and Quantum telescopes.
Questar Overview: Company Seven's Questar pages.
Online Discussion Forums
Questar Forum on Cloudy Nights.
Questar User Group on Groups.io: Successor to the Questar User Group on Yahoo! Groups (requires free membership).
90mm Maksutov Comparo: a thoughtful comparison of the 3.5-inch Questar, Celestron C90, and Meade ETX 90 by Ed Ting.
Questar 3.5 Review by Roger Vine.
Questar 3.5" Standard Model by Allister St. Claire.
The Questar 3.5 Standard by Malcolm Bird. See also his comparison of the Standard Questar and the Tele Vue-85.
Test Report: The Questar 3.5 Inch by Clive Gibbons.