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How to Focus Questar Telescopes

The Questar line of telescopes offers a different method of adjustment from many other types of telescopes, such as the Schmidt-Cassegrain style or the standard refractor style. Such telescopes provide a knob connected to the eyepiece receptacle itself, allowing rotation to move the actual eyepiece up and down within the receptacle, which results in change of focus. With the Questar line of telescopes, the focus knob is located on the "control box" at the rear of the telescope body, just below the eyepiece. Once the focus control knob has been identified, rotation of it moves an internal mirror for focus.

Instructions

- 1
  Orient yourself so that you are at the rear of the telescope, looking at the eyepiece and the control knobs and levers of the "control box" at the rear of the telescope.
- 2
  Identify the focus knob on the control box. The focus knob on the Questar control box is the smallest knob at the bottom of the control box, or the knob closest to the ground under the telescope.
- 3
  Aim the Questar telescope at an object you desire to view and center it in the field of view while looking into the eyepiece. Rotate the focus knob left and right to focus the image as desired. Rotation of the focus knob on a Questar telescope moves an internal mirror rather than the eyepiece itself.

Astronomy