Questar Corporation is considered a world leader in the development and manufacture of high quality Maksutov Catiopitc lens systems.  They manufacture precision optical for the public, industrial, aerospace and military markets. 

Questar Corporation manufactures high quality Maksutov-Cassegrain telescopes.  The Questar 3.5 telescope is one of the finest personal telescopes on the market.  It has legendary resolution, flatness of field and contrast.  For astronomy enthusiasts who want a more powerful telescope, the Questar 7 is perfect for them.  It has twice the resolve power; four times the light grasp and two times the effective focal length of the Questar 3.5.  Questar created a special edition telescope for their 50th anniversary, the Questar 50th Anniversary 3.5 telescope.  Their newest telescope is the Questar Lightweight Titanium 7 telescope.

Questar also produces spotting scopes.  The Questar Field Ranger spotting scope model is the ultimate scope.  It is designed for terrestrial observation and photography. It can also be used for observing the sky when it is mounted on a pan head.  The Questar Birder is popular among bird watchers.  This spotting scope has rapid focus that aids with speed and precision when changing powers or pursuing targets.

For the sun observer, Questar created the Maximum-Resolution Solar Spectrometer (QMAX).    The Questar QMAX attaches easily to the Questar 3.5 telescope or Questar 7 telescope.  It blocks ultraviolet and infrared radiation while allowing the sun’s visible light, the visible solar spectrum, to be viewed in true and gorgeous color.

Questar have a vast range of astronomy of accessories.  They offer photographic filters, telescope filters and solar filters, telescope mounts, diagonals, adapters and many other accessories.