Manual Celestron Ambassador Series (page 10 of 66) (English, German, French, Italian, Spanish)

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A telescope is an instrument that collects and focuses light. The nature of the optical design determines how

the light is focused. The refractor telescope uses lenses in its optical design.

Developed in the early 1600s, the refractor is the oldest telescope design. It derives its name from the

method it uses to focus incoming light rays. The refractor uses a lens to bend or refract incoming light rays,

hence the name (see Figure 3-1). Early designs used single element lenses. However, the single lens acts

like a prism and breaks light down into the colors of the rainbow, a phenomenon known as chromatic

aberration. To get around this problem, a two-element lens, known as an achromat, was introduced. Each

element has a different index of refraction allowing two different wavelengths of light to be focused at the

same point. Most two-element lenses, usually made of crown and flint glasses, are corrected for red and

green light. Blue light may still be focused at a slightly different point.

For the 80mm Ambassador, simply turn the focus knob (located in front of the diagonal – see Figure 3-2).

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.

For the 50mm Ambassador, simply turn the large knurled ring shown in Figure 3-3. Turning the focus ring

counterclockwise allows you to focus on an object that is closer than the one you are currently observing.

Turning the focus ring clockwise allows you to focus on an object farther than the one you are currently

observing. Remember to remove the front objective cap prior to observing through the telescope.

Note: If you wear corrective lenses (specifically glasses), you may want to remove them when observing

with the telescope. If you have astigmatism, corrective lenses must be worn at all times.

Figure 3-2 Figure 3-3

Figure 3-1

A cutaway view of the light path of the Refractor optical design

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Celestron Ambassador Series Manual

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