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Hubble Optics Ultra Light UL 16 
Dobsonian 

instruction manual

REV: 1.1.5 02-12-2013

Please read these instructions thoroughly before beginning assembly 
and subsequent use of the telescope.

1.Unpacking

 

                                                                                                                   

 

 

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2. Assembly

 

                                                                                                                    

 

 

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2.1 Install the Secondary Mirror 

 

                                                                                 

 

 

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2.1.1 Install the Secondary to the diagonal holder

 

                                                  

 

 

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2.1.2 Install the Secondary Mirror Cage

 

                                                                 

 

 

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2.2 Assembly of the Dobsonian Rocker

 

                                                                    

 

 

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2.3 Assembly of the Mirror Box

 

                                                                               

 

 

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2.3.1 Installation of the Pads and Brass Wires 

 

                                                     

 

 

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2.3.2.  Installation of the Lower ALT Bearing Sections

 

                                       

 

 

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2.4 Install The Truss Tubes and Secondary Cage

 

                                                     

 

 

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2.4.1 Installation of the Truss Tubes

 

                                                                     

 

 

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2.4.2 Installation of the Secondary Mirror Cage

 

                                                   

 

 

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2.4.3 Installation of the Optional Finder Scope

 

                                                     

 

 

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2.5 Adjust the Sling

 

                                                                                                   

 

 

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3. Collimate the Optics.

 

                                                                                               

 

 

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4. Care and Maintenance

 

                                                                                            

 

 

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4.1 Mirror Storage

 

                                                                                                     

 

 

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4.2 Mirror Cleaning

 

                                                                                                   

 

 

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5. Specifications

 

                                                                                                           

 

 

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6. Limited Warranty

 

                                                                                                   

 

 

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7. Technical Support

 

                                                                                                   

 

 

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WARNING: 

Never look at the sun with your telescope without a  

professionally made solar filter. Permanent eye damage or blindness  
could result. Eye damage is often painless, so there is no warning until  
it is too late. Children should not be allowed to handle the telescope.  
Avoid using the type of solar filter that screws into an eyepiece. They  
are susceptible to cracking under the intense heat that builds up near  
the focus point, and could cause severe retinal damage. Use only the  
type of solar filter that covers the front of the telescope. Also, be sure to  
leave the cover caps on the finder scope when solar observing. Better  
yet, remove the finder scope altogether when viewing the sun.

1

Summary of Contents for Ultra Light UL 16

Page 1: ...tional Finder Scope 26 2 5 Adjust the Sling 27 3 Collimate the Optics 28 4 Care and Maintenance 31 4 1 Mirror Storage 31 4 2 Mirror Cleaning 32 5 Specifications 33 6 Limited Warranty 34 7 Technical Su...

Page 2: ...spider hub and the diagonal secondary mirror holder 1 Mirror Box Rocker and Ground Board 1 Focuser L bracket with 2 M5 x 16 screws 1 Secondary mirror 1 2 10 1 dual speed focuser 3 Plastic feet with wi...

Page 3: ...Figure 1 Mirror Box Figure 2 Upper Ring 3...

Page 4: ...Figure 3 Spider Vanes 4...

Page 5: ...Figure 4 Secondary Spider Hub Diagonal Support Figure 5 Focuser L Bracket Figure 6 14 Knob Screws 5...

Page 6: ...Box 2 The primary mirror Qty Description 1 Primary Mirror 6...

Page 7: ...amiliarized yourself with all of the parts in front of you it s time to begin assembly You ll need a regular screwdriver a Phillips screwdriver a set of metric hex keys 1 5 2 2 5 3 4 and 5mm two 6 inc...

Page 8: ...lightly and carefully slide the secondary mirror into the baffle from the back let the mirror lightly held by the baffle s rim Then place the fiber fill behind the secondary mirror to support the mirr...

Page 9: ...econdary holder until the secondary mirror is centered by being viewed from the focuser draw tube Adjust and tighten the three collimation screws When installing the holder into the spider you should...

Page 10: ...Figure 8 Attach the three spider wings to the spider hub Figure 9 Attach the three spider wings to the upper ring 10...

Page 11: ...Figure 10 Attach the focuser L bracket to the upper ring Figure 11 Attach the focuser to the L bracket 11...

Page 12: ...Figure 12 3 collimation screws evenly between the vanes Figure 13 Attach the secondary holder with the secondary mirror 12...

Page 13: ...Figure 14 Center the secondary in the focuser drawtube 13...

Page 14: ...f the Dobsonian Rocker The UL16 base is shipped assembled The only thing you need to do is to install the three plastic feet Make sure to use the wing nuts to lock the three feets 2 3 Assembly of the...

Page 15: ...is mostly assembled already but you do need to place the primary mirror into the mirror box 2 3 1 Installation of the Pads and Brass Wires Before installing the primary mirror you need to perform the...

Page 16: ...oles on the support bars and then bend the head portions to lock the brass wires in the position Push the brass wires outward into a slight curve to keep the support bars in position 2 3 2 Installatio...

Page 17: ...that 3 collimation knobs and 3 locking screws are installed then rest the Mirror Box on its side Place the two spacers around the ALT bearing installation holes Please note that the spacers are alrea...

Page 18: ...r lower ALT bearing section 2 3 3 Installation of The Upper Lower ALT Bearing Section Place the mirror box onto the Rocker box Then install and bolt the ALT upper bearings sections one at time to the...

Page 19: ...irror box can be stored and transported folded in the following way 2 3 4 Installation of the Primary Mirror Rotate the two eccentric side pins to make room for the primary mirror Loosen the locknuts...

Page 20: ...open the split bolts and insert the sling into the slot Also loosen the nuts on the two split bolts that hold the sling Stretch the sling loosely around the two lower side pins Figure 16 Open the slot...

Page 21: ...e side pins The mirror protecting clips should not contact the mirror at all Keep the clips about 3 6mm above the mirror surface Place the mirror clips over the mirror and tighten the top lock nuts At...

Page 22: ...ted with a mirror box cover which can be as simple as a square cut out of cardboard Connect two truss tubes with an M6 knob screw 20mm long and an M6 wing nut on the multiple hole side of the top end...

Page 23: ...Figure 19 Tighten the knob screws 23...

Page 24: ...as possible but make sure they are still fully engaged on the bolts Hold the secondary cage up and slide one of the slots on the upper ring into the top knob bolt of one truss pair Make sure you slid...

Page 25: ...Figure 20 Slide in one slot first 25...

Page 26: ...slot Figure 22 The slide in other two slots at the same time 2 4 3 Installation of the Optional Finder Scope Use 2 provided hexagon or cross socket sunk head screws to mount the finder scope using two...

Page 27: ...2 5 Adjust the Sling After UL16 is fully assembled the sling must be adjusted 27...

Page 28: ...ate that pin away from mirror until there is a few mm gap between the mirror and the pin The mirror must be supported be the sling and not be the side pins 3 Collimate the Optics Keep the primary mirr...

Page 29: ...versized to allow the focuser to be adjusted to a certain degree You will have to remove the focuser to adjust the L bracket mounting screws You may have to re adjust the spider if it is still not cen...

Page 30: ...Figure 23 The primary mirror is not yet collimated Figure 24 The primary mirror is collimated by laser collimator 30...

Page 31: ...he star image at the center of the eyepiece All rings and shadows should be concentric If not perform the collimation by adjusting the three primary mirror collimation screws until all rings and shado...

Page 32: ...osen the sling by loosening the lock nuts on the right split bolts with two wrenches Carefully loosen the three retaining clips and rotate all clips away from the mirror to clear the way for the mirro...

Page 33: ...nal rinse should be with distilled water Repeat the process with the small secondary mirror 5 Specifications Optical design Reflector Optical diameter 406mm Focal length 1829mm Focal ratio f 4 5 Optic...

Page 34: ...urchase price at Seller s sole option shall be the Buyer s exclusive remedies Seller shall not be responsible for any indirect special or consequential damages arising from use of the products This wa...

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