Celestron 91518 User Manual download pdf (Page 4)

SINCE 1609, when the great Italian scientist Galileo first introduced a rudimentary

telescope to astronomy that gave a glimpse of the mysteries lying within the night sky, a fasci-

nation to further explore the vast Universe became a constant lure to the curious at heart. By

today's standard, that telescope was not much more than ordinary opera glasses. However,

that fascination with the mysteries of night skies continued through the ensuing four centuries

and triggered immense optic discoveries, culminating in the 21st century, in an ever-growing

market not only of professionals but also of serious amateur astronomers and space enthusi-

asts, young and old alike.

Today, Southern California-based Celestron has captured the enviable

worldwide reputation as a leader in designing, manufacturing and

importing high-quality optical products, including computerized and

non-computerized telescopes and related accessories, binoculars,

spotting scopes and microscopes. The Celestron brand is recognized for

its superior optics, outstanding design and innovative technology by

serious amateur astronomers.

Celestron was first founded in the 1950's as Valor Electronics, an

aerospace electronics firm by Tom Johnson, who, while searching for a suitable telescope for

his two young sons, decided to build a telescope from scratch. Starting with a 6-inch reflector,

he progressed to building increasingly larger and more sophisticated designs. Tom's hobby

soon grew into a full-time business, offering Schmidt-Cassegrain telescopes in 4-inch to 22-inch

models.

His immediate challenge was to find a way to efficiently produce the Schmidt corrector plate

used in the top-of-the-line catadioptric telescopes

(hybrid of reflector and refractor telescope design).

Although a corrector plate appears flat, it has a

“wavy” surface that is difficult to mass-produce using

standard equipment and procedures. By 1970

Celestron designers and engineers announced a revo-

lutionary method of producing Schmidt-Cassegrain

telescopes at reasonable cost and in volume. This

optical breakthrough was incorporated in the first

Celestron C8. The popularity of the C8 in the con-

sumer marketplace led to the C5 and then to larger

versions including an 11-inch and 14-inch telescope.

Today the Celestron product line still features these

models and other quality optical products.

History of Celestron

CELESTRON,

OVER

40 YEARS

OF TELESCOPE

HISTORY.

1 2 3 4 5 6 7 8 9 ... 43 44

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Celestron 91518 User Manual Page 4