Celestron 70 manual Image Orientation, Focusing

Figure 2 - Balancing in R.A.

Telescope Basics

Figure 3 - Balancing in Declination

A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused. Some telescopes, known as refractors, use lenses. Other telescopes, known as reflectors, use mirrors.

Your Firstscope telescope is a refractor telescope that use an objective lens to collect its light.

Image Orientation

The image orientation of any telescope changes depending on how the eyepiece is inserted into the telescope. When observing through a refractor telescope using the star diagonal, the image will be right side up, but reversed from left to right. However, when observing straight through, with the eyepiece inserted directly into the telescope, the image will be inverted.

.

Actual image as seen with the

unaided eye

Inverted image, as viewed with the eyepiece directly in telescope

Figure 5

Focusing

To focus your telescope, simply turn the focus knob located directly below the eyepiece holder. Turning the knob clockwise allows you to focus on an object that is farther than the one you are currently observing. Turning the knob counterclockwise from you allows you to focus on an object closer than the one you are currently observing.

•If you wear corrective lenses (specifically glasses), you may want to remove them when observing with an eyepiece attached to the telescope. However, when using a camera you should always wear corrective lenses to ensure the sharpest possible focus. If you have astigmatism, corrective lenses must be worn at all times.

7