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Celestron 70 manual

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Table of contents for the manual

  • Page 1

    F F I I R R S S T T S S C C O O P P E E 7 7 0 0 & & 9 9 0 0 E E Q Q T T E E L L E E S S C C O O P P E E I I N N S S T T R R U U C C T T I I O O N N M M A A N N U U A A L L F F i i r r s s t t s s c c o o p p e e 7 7 0 0 E E Q Q - - # # 2 2 1 1 0 0 7 7 6 6 ● ● F F i i r r s s t t s s c c o o p p e e 9 9 0 0 E E Q Q - - # # 2 2 1 1 0 0 8 [...]

  • Page 2

    2 F F i i r r s s t t s s c c o o p p e e R R e e f f r r a a c c t t o o r r 70mm EQ shown 1 2 6 4 7 8 9 10 11 12 13 14 16 17 3 5 15[...]

  • Page 3

    3 IDENTIFYING P ARTS OF YOUR FIRSTSCOPE 1. Telescope Tube 10. Tripod 2. Tube Ring 11. Counterweight 3. Star Pointer Finderscope 12. Counterweight Bar 4. Eyepiece 13. Right Ascension Slow Motion Cable 5. Star Diagonal 14. Right Ascension Setting Circle 6. Focuser 15. Equatorial Mount 7. Declination Slow Motion Cable 16. Declination Circle 8. Latitud[...]

  • Page 4

    4 A A s s s s e e m m b b l l i i n n g g Y Y o o u u r r T T e e l l e e s s c c o o p p e e 1) Your Firstscope telescope shoul d include all of the foll owing: a. Tripod with center support bracket b. Telescope tube with tube ring at tached c. Equatorial mount head d. Two 1 ¼" eyepieces e. 90 ˚ star diagonal f. StarPointer Finderscope g. 2[...]

  • Page 5

    5 10) Loosen the set screw on the star diagonal so that i t does not obstruct the inner diameter of the barrel. Insert the chrome barrel of the 20mm eyepiece into the diagonal and tighten the set screw. See Fi gure B 11) Locate the StarPointer finderscope. R emove the knurled nut s on the threaded posts at the focuser end of the telescope tube. Mou[...]

  • Page 6

    6 2. To turn on the Star Poin ter, slide the On/Off switch to the 1 "On" position. To in crease the brightness level o f the red dot, slide the switch t o the 2 "On" position. 3. Locate a bright star or planet and center it in a low power eyepiece in the main telescope. 4. With both eyes open, look through the glass wi ndow at t[...]

  • Page 7

    7 Actual image as seen with the unaided eye Inverted image, as viewed with the eyepiece directly in telescop e T T e e l l e e s s c c o o p p e e B B a a s s i i c c s s A telescope is an instrum ent that coll ects and focuses light. The nature of the optical design determ ines how t he light i s focused. Some tele scopes, known as refractors, use[...]

  • Page 8

    8 The Celestial Coordinate System To help find objects in the sky, astronomers use a celestial coordinate system that is similar to our geographical coordinate system here on Earth. The celestial coordinate system has poles, lines of longitude and latitude, and an equator. For the most part, these remain fixed against the background stars. The cele[...]

  • Page 9

    9 description of stellar motions also applies to the southern hemisphere except all stars south of the celestial equator move aro und the south celestial pole.) Latitude Scales The easiest way to polar align a telescope is with a latitude scale. Unlike other methods that require y ou to find the celesti al pole by identifying certain stars near it,[...]

  • Page 10

    10 3. Adjust the mount in altitude and/or azimuth until Polaris is in the field of view of the finder. 4. Center Polaris in the field of the telescope using the fine adjustment controls on the mount. Remember, while Polar aligning, do NOT move the telescope in R.A. or DEC. You do not want to move the telescope itself, but th e polar axis. The teles[...]

  • Page 11

    11 Using the Setting Circles Setting Circles are dials (or gauges) for right ascension and declination that allow you to locate celestial objects easily from their coordinates as listed in a star chart or atlas. 1. The declination setting circle (#16) is scaled in degrees and the right ascension setting circle is incremented in minutes. The circles[...]

  • Page 12

    12 M M A A G G N N I I F F I I C C A A T T I I O O N N ( ( P P O O W W E E R R ) ) The magnification (or power) of a telescope is variable depending upon the focal length of the eyepiece being used along with the focal length of t he telescope. In equation form at, the formul a looks like this: Magnification FL telescope FL eyepiece = () () To dete[...]

  • Page 13

    13 CELESTIAL OBSER VING Now that your telescope i s set up, you’re ready to use i t for observing. This section covers vi sual observing for both solar system and deep-sky object s. Observing the Moon In the night sky, the moon is a prime target for your first look because it is extrem ely bright and easy to find. Although the beauty of the full [...]

  • Page 14

    14 Observing Deep-Sky Objects Deep-sky objects are simpl y those objects outside the boundaries of our sol ar system. They include star clusters, planet ary nebulae, diffuse nebulae, double stars and other gal axies outside our own Mi lky Way. Unlike the sun, m oon and our five major planets, m ost deep-sky objects are not vi sible to the naked eye[...]

  • Page 15

    15 condition and five the best. Seeing condi tions can be classified in one of three cat egories. The defini tions of these categories are based on the causes of the different seeing condi tions. Type 1 seeing conditions are characterized by rapid changes in the image seen through the telescope. Extended object s, like the moon, appear to shim mer [...]

  • Page 16

    16 S S P P E E C C I I F F I I C C A A T T I I O O N N S S #21076 #21085 Optical System: Refractor Refractor Ap er tu re: 70 mm (2 .8 ") 90 mm (3 .5 ") Focal Length: 900mm 1000mm F/ratio: f/13 f/11 Focuser Rack and Pinion Rack and Pinion Standard Oculars (or Eyepieces) 20mm 1¼" (45x) 10mm 1¼" (90x) 20mm 1¼" (50x) 10mm 1?[...]

  • Page 17

    17 • Ultima - Ultima is our 5-element, wide field eyepiece design. In the 1-1/4" barrel diameter, they are available in the following focal lengths: 5mm, 7.5m m, 10m m, 12.5m m, 18m m, 30m m, 35m m, and 42m m. These eyepieces are all parfocal. • Axiom – As an extension o f the Ultima line, a new wide angle series is offered – called th[...]

  • Page 18

    18 black. You can see detail in sunspots, bright faculae near the limb and the mottled areas known as granules with these filters . The Sun o ffers constant ch anges and will keep your observing interestin g and fun. Ev en small aperture telescopes can enjoy features of the Sun. T-Adapter (#93625) - T-Adapter (with additional T-Ring) allows you to [...]

  • Page 19

    19 CELESTRON TWO YEAR W ARRANTY A. Celestron warrants this telescope to be free from defects in m aterials and workmanship for two years. Celestron will repa ir or replace such product or part thereof which, upon inspection by Celestron, is found to be defective in m aterials or workm anship . As a condition to the obligation of Celestron to repair[...]

  • Page 20

    Celestron 2835 Columbia St reet Torrance, CA 90503 U.S.A. Tel. (310) 328-9560 Fax. (310) 212-5835 Web site at www.celestron.com Copyright 2004 Ce lestron All rights reserved. (Products or instructions m ay change without notice or obl igation.) Item # 21076-INST $10.00 01-05 Printed in China[...]