Celestron Ultima 80 User Manual

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IDENTIFYING PARTS OF YOUR FIRSTSCOPE

PowerSeeker 80EQ

1. Objective Lens 10 Right Ascension (R.A.) Setting Circle

2. Declination Setting Circle 11 Slow Motion Controls

3. Equatorial Mount 12. Focus Knob

4. Counterweight Bar 13. Star Diagonal

5. Counterweight 14. Eyepiece

6. Accessory Tray 15. 5x24 Finderscope

7. Tripod Leg 16. Tube Ring

8. Tripod Leg Tightening Screws 17. Camera Piggyback Adapter

9. Latitude Adjustment Screw

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Thank you for purchasing this Celestron Refractor Telescope. This telescope is a precision scientific instrument. With it you will enjoy numerous objects in the sky—planets, nebulae, star clusters, galaxies and other astronomical objects.

This manual covers the 80mm equatorial model. The equatorial mount contains setting circles and slow motion cables to make it easier to locate and track astronomical objects.

But, before your journey begins take time to read this manual to familiarize yourself with the operation and parts of your telescope.

WARNING—NEVER LOOK AT THE SUN WITH YOUR TELESCOPE OR ITS FINDERSCOPE. PERMANENT AND IRREVERSIBLE EYE DAMAGE MAY RESULT AS WELL AS DAMAGE TO YOUR TELESCOPE. HOWEVER, YOU MAY ENJOY LOOKING AT THE SUN IF YOU HAVE A SAFE METHOD OF DOING SO, SUCH AS A CELESTRON SOLAR FILTER.

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1) Your Celestron telescope should include all of the following:

a. Tripod with center support bracket b. Telescope tube with tube rings attached c. Equatorial mount head d. Two 1 ¼" eyepieces e. 90˚ star diagonal f. 5x24 Finderscope g. 3x Barlow Lens h. 5# Counterweight i. Counterweight bar j. Two slow motion cables k. Eyepiece accessory tray l. The Sky CD rom

2) To set up the tripod, spread the legs outward until they are fully extended. Extend the center portion of each of the three tripod legs down 6-8". Use the three tightening screws located at the bottom of each leg to secure the extended legs in place.

3) Place the accessory tray on top of tripod's center leg brace. Thread the tray's threaded post into the threaded hole in the center of the leg brace.

4) Locate the equatorial mount and place the base of the mount through the hole in the center of the tripod mounting platform. From underneath the tripod mounting platform, thread the mounting bolt with washer into the threaded hole on the bottom of the equatorial mount.

5) Thread the latitude adjustment screws into the equatorial mount until both screws are touching the inside of the mount and the mount can no longer pivot up and down.

6) Locate the counterweight bar and counterweight. Thread the threaded end of the counterweight bar into the Dec axis of the equatorial mount. Remove the safety screw and washer from the other end of the counterweight bar. Loosen the counterweight locking bolt so that the screw is no longer obstructing the center hole of the counterweight. Slide the counterweight half way up the counterweight bar and tighten the locking screw to secure the counterweight in place. Thread the safety screw and washer on to the end of the counterweight bar.

7) Slide the chrome end of the slow motion control cables onto the equatorial mount gear shaft. See Figure 1. The longer cable should attach to the Right Ascension axis and the shorter cable attaches to the Declination axis.

8) Remove the wing nuts from the threaded post at the bottom of the tube ring. Place the telescope tube on top of the equatorial mount so that the threaded posts slide through the holes on the equatorial mount. The declination slow motion cable should extend towards the focuser end of the telescope tube. Replace the wing nut and tighten to hold the telescope in place.

9) Remove the plastic cap covering the end of the focuser. Loosen the set screw on the focuser so that it does not obstruct the inner diameter of the focuser. Insert the chrome barrel of the star diagonal into the focuser and tighten the set screw.

10) Loosen the set screw on the star diagonal so that it 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 Figure 2.

Figure 1

11) Locate the finderscope. Remove the knurled nuts on the threaded posts at the focuser end of the telescope tube. Mount the finderscope bracket by placing the bracket over the posts protruding from the tube and tightening it down with the knurled nuts. Orient the finderscope so that the large lens is facing towards the front of the tube. See figure 3

12) Remove the lens cap from the front of the telescope.

Aligning the Finderscope

1) Locate a distant daytime object and center it in a low power eyepiece in the main

telescope.

2) Look through the finderscope and take notice of the position of the same object.

3) Without moving the main telescope, turn the adjustment thumb screws located

around the finderscope bracket until the crosshairs of the finder are centered on the alignment object.

Using the Barlow Lens

1) Your telescope also comes with a 3x Barlow lens which triples the magnifying

power of each eyepiece (see Magnification section of the manual). To use the barlow lens, remove the diagonal and insert the barlow lens directly into the focuser. Then start by using the low power eyepiece such as the 20mm, and insert it either directly into the barlow lens or into the diagonal. See Figure 4.

Figure 2

Figure 3

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Moving Your Telescope:

To change the direction your telescope is pointing:

1. To move the telescope in declination (north/south) there are two options. For large and quick movements, loosen the

declination knob (see figure 9) when moving the telescope and then tighten the knob when you are near the position you want. For very small movements and fine adjustments, use the declination cable. The declination cable has a range of about 30° and if you come to the stop at the end of its travel, do not try to force movement when the declination cable has reached the stop. Instead loosen the declination knob and manually move the telescope in declination until you pass the object in the opposite direction. Then tighten the knob and reverse the direction of the declination cable.

2. To move the telescope in right ascension (east/west) there are two options. For large and quick movements, loosen

the right ascension knob (#11) when moving the telescope and then tighten the knob when you are near the position

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Figure 4

you want. For very small movements and fine adjustments, turn the right ascension cable. Unlike the declination cable, the right ascension cable has 360˚ of continuous motion.

Balancing the Telescope in Right Ascension (R.A.):

The telescope should be properly balanced in order for it to move smoothly in both axes. Proper balance is essential if using an optional motor drive for accurate tracking.

1. To balance the right ascension axis, move the counterweight shaft so it is parallel (horizontal) to the ground. (See

figure 5). Slowly release the right ascension knob and see if the optical tube moves. If the optical tube moves, then slide the counterweight up or down the counterweight shaft until the optical tube remains stationary in the parallel position to the ground. When this happens, make sure the counterweight lock is tight.

Balancing the Telescope in Declination (DEC):

The telescope should also be balanced on the declination axis to prevent any sudden motions when the DEC clamp is released. To balance the telescope in DEC:

1. Release the R.A. clamp and rotate the telescope so that it is on one side of the mount (i.e., as described in the previous section on balancing the telescope in R.A.).Lock the R.A. clamp to hold the telescope in place. Release the DEC clamp and rotate the telescope until the tube is parallel to the ground (see figure 6). Release the tube — GRADUALLY — to see which way it rotates around the declination axis. DO NOT LET GO OF THE TELESCOPE TUBE COMPLETELY! Loosen the screws that hold the telescope tube inside the mounting rings and slide the telescope tube either forwards or backwards until it remains stationary when the DEC clamp is released. Tighten the tube ring screws firmly to hold the telescope in place.

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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. Some telescopes, known as refractors, use lenses. Other telescopes, known as reflectors, use mirrors. Your telescope is a refractor telescope that use an objective lens to collect its light.

Figure 5 - Balancing in R.A.

Figure 6 - Balancing in Declination

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.

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