Orion 52986 Instruction Manual Download Page 2

2

Table of Contents 

Page

I.   Parts 

2

II.   Assembly 

2

III.  Preparing the Telescope For Operation 

4

IV.   Understanding and Using the  

  Equatorial Mount 

6

V.   Astronomical Observing 

12

VI.   Collimation of Your Telescope’s Optics 

13

VII.  Telescope Care and Maintenance 

14

VIII.  Useful Optional Accessories 

15

IX.  Specifications 

16

I. Parts

Unpack all of the parts and lay them out on the floor. Make 
sure all the parts listed below and shown in 

Figure 1

 are pres-

ent. Save the shipping box and packaging material. In the 
unlikely event that you need to return the telescope, you must 
use the original packaging. Initial assembly of the telescope 
should take only about 15 minutes

Part

 

Qty

A, B, or C – Optical tube assembly 

1

D, E, or F – Dust cover 

1

G – Tripod 

1

H – Equatorial mount 

1

I – Accessory tray 

1

J – Slow-motion cables 

2

K – Counterweight shaft 

1

L – 6x30 finder scope (90mm and 134mm models) 

1

M – 25mm Plossl eyepiece, 1.25" 

1

N – 10mm Plossl eyepiece, 1.25" 

1

O – Mirror star diagonal, 1.25" (90mm model only) 

1

P – Red dot finder scope (114mm model only)  

1

Q – Counterweight 

1

II. Assembly

1.  Spread the tripod (G) legs apart and stand it on the ground 

(

Figure 2

). You can extend the legs to the desired height 

later using the leg lock knobs. For now just keep them fully 
retracted. 

2.  Unscrew the accessory tray locking knob from the center 

of the tripod leg brace. Then place the tray’s (I) center hole 
over the center of the leg brace (

Figure 3

). Finally, screw 

the tray locking knob clockwise into the threaded hole until 
tight. 

3.  Now you will attach the equatorial mount (H) to the tripod. 

Place the base of the mount over the tripod’s mounting 
platform (

Figure 4

) , then tighten by turning the mount 

attachment knob located under the mounting platform 
clockwise until just lightly tightened (

Figure 5

). 

4.  Next, place the counterweight (Q) onto the counterweight 

shaft (K), as shown in 

Figure 6

. Loosen the counter-

weight lock knob to allow the counterweight to slide onto 
the shaft, then tighten the knob. Then thread the counter-
weight shaft into the mount housing (

Figure 7

) until tight. 

Alternatively, you could thread on the shaft first and then 
slide the counterweight onto it after removing the hex-head 
bolt and washer from the bottom end of the shaft. 

5.  Attach the slow motion cables (J) to the gear shafts by 

orienting the cable so that the thumbscrew seats in the 
groove of the gear shaft, as shown in 

Figure 8

. Then 

firmly tighten the thumbscrew. The longer cable should be 
attached to the declination gear shaft; the shorter cable to 
the right ascension gear shaft (

Figure 9

). 

The EQ mount is now properly attached to the tripod (

Figure 

10

). Next, you’ll attach the optical tube to the EQ mount.

6.  Before proceeding, make sure the right ascension and 

declination lock knobs (see 

Figure 10

 inset) are tightened 

so that the mount won’t swivel accidentally when you’re 
attaching the tube rings or the optical tube. 

7.  The optical tube (A, B, or C) arrives in the shipping box 

with the tube ring(s) clamped around it, and the dovetail 
mounting bar attached to the bottom of the tube rings. 
After removing the tissue paper, make sure the tube ring 
assembly is secured around the optical tube by lightly 
tightening the tube ring clamp knobs (

Figure 11

). 

8.  Lift the optical tube and set the dovetail mounting bar into 

the mount’s saddle as shown in 

Figure 11

 (make sure the 

saddle lock knob is backed sufficiently to allow the dovetail 
bar to seat properly). When the dovetail bar is seated in 
the saddle, tighten the saddle lock knob until tight. 

9.  Now you’ll attach the finder scope (P or L) to the optical 

tube. For the 114mm reflector models, it will be the red dot 
finder scope (P). Push the bracket into the finder scope 
base as shown in 

Figure 12

 until it is all the way in. For 

the 90mm refractor and 134mm reflector, you will install 
the 6x30 achromatic finder scope (L), which provides 6x 
magnification and has a 30mm aperture. First remove the 
two round thumb nuts near the focuser (see 

Figure 13

). 

(Do not remove the two small hex nuts underneath them!) 

Warning: Never look directly at the Sun through 

your telescope—even for an instant—without a 

professionally made solar filter that completely 

covers the front of the instrument, or permanent 

eye damage could result. Young children should 

use this telescope only with adult supervision.

Summary of Contents for 52986

Page 1: ...ion or any of its contents may be reproduced copied modified or adapted without the prior written consent of Orion Telescopes Binoculars A N E M P L O Y E E O W N E D C O M P A N Y 52988 52986 52987 C...

Page 2: ...lternatively you could thread on the shaft first and then slide the counterweight onto it after removing the hex head bolt and washer from the bottom end of the shaft 5 Attach the slow motion cables J...

Page 3: ...3 Figure 1 A Parts included with the Orion Observer EQ telescopes B Optical tube assemblies of the Observer EQ telescopes H P I E F K L A B C G J M D Q O N O A B...

Page 4: ...he telescope For larger telescope move ment release the RA and Dec axis lock knobs Figure 16 and move the telescope tube by hand to the approximate location then retighten the lock knobs and make fine...

Page 5: ...adjustments to the alignment thumbscrews until the image in both the finder scope and the telescope s eye piece is exactly centered When it is no further adjustment of the finder scope will be needed...

Page 6: ...ng the shaft until it exactly counterbalances the telescope That s the point at which the shaft remains horizontal even when you let go of the telescope with both hands 3 Retighten the counterweight l...

Page 7: ...ccomplished by slowly rotating the telescope on its right ascension R A axis using only the R A slow motion cable But first the R A axis of the mount must be aligned with the Earth s rotational polar...

Page 8: ...ot make any further adjustments to the azimuth or the latitude of the mount nor should you move the tripod Doing so will ruin the polar alignment The telescope should be moved only about its R A and D...

Page 9: ...object through the telescope you ll see it drift slowly across the field of view To keep it in the field assuming the equatorial mount is polar aligned just turn the R A Figure 16 The R A and Dec loc...

Page 10: ...in the Northern Hemisphere The Dec setting circle is denoted in degrees with each main mark representing 10 increments 1 10 2 20 etc Values of Dec coordinates range from 90 to 90 The 0 mark indi cates...

Page 11: ...ng circles are not accurate enough to put an object dead center in the telescope s eyepiece but they should place the object somewhere within or near the field of view of the finder scope assuming the...

Page 12: ...r that mat ter Your eyes take about 30 minutes to reach perhaps 80 of their full dark adapted sensitivity As your eyes become dark adapted more stars will glimmer into view and you ll be able to see f...

Page 13: ...nt size optional higher power eyepieces or a Barlow lens are recommended and often needed for detailed obser vations B The Sun You can change your nighttime telescope into a daytime Sun viewer by inst...

Page 14: ...and error to determine which screws to loosen and tighten to move the reflection of the primary mirror to the center of the secondary mirror But be patient and you ll get it Aligning the Primary Mirr...

Page 15: ...me with your telescope Motor Drive A motor drive which attaches to the right ascension axis of an equatorial telescope mount enables your telescope to track the motion of stars and other celestial obj...

Page 16: ...German equatorial Tripod Aluminum Total instrument weight 16 lbs 1 5 oz Observer 134mm EQ Reflector Primary mirror diameter 134mm 5 3 Primary mirror coating Aluminum with silicon dioxide SiO2 overcoat...

Reviews: