Explore Scientific Truss-tube Dobsonian Instruction Manual Download Page 9

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Adjusting the main mirror

Once the secondary appears round and the mark on the main mirror is centered, check the collimation of the

main mirror. If the reflection of your eye and the reflection of the secondary mirror on the main mirror are not

concentric, insert the collimating tool into one of the collimation screws that are located on each side of the main

mirror, Figure 9.1. When you turn the collimation tool you will notice that the hexagonal head of the tool will lock

into the hexagonal head of the collimation screw. Now you can adjust the main mirror by turning the collimation

tool, Figure 9.2. Adjust the screws until the eye and the reflection of the secondary are centered in the main mirror.

Practice this until you get a feel of what a turn of one of the collimation screws is doing.

Collimation

Figure 9.1

Figure 9.2

Collimation Screw

Collimation Tool

Summary of Contents for Truss-tube Dobsonian

Page 1: ...MENTS DURING THE DAYTIME NEVER ALLOW ANYONE TO USE THE TELESCOPE OR A FINDER SCOPE DURING THE DAYTIME WITHOUT WARNING THEM OF THE HAZARDS OF AIMING EITHER AT OR NEAR THE SUN MAKE SURE THAT THEY ARE AD...

Page 2: ...ITY ON THE MATTER IF NECESSARY AND RECYCLE MATERIALS WHEN POSSIBLE THE WEEE SYMBOL IF PRESENT INDICATES THAT THIS ITEM CONTAINS ELECTRICAL OR ELECTRONIC COMPONENTS WHICH MUST BE COLLECTED AND DISPOSED...

Page 3: ...er 11 Red dot finder 12 Tension latch Figure 1 Telescope Parts Overview Recommended accessories that are not included Counterweights sold separately contact customer service at 1 866 252 3811 for more...

Page 4: ...ndary mirror cage to the truss pairs 2 long screws with knob to secure the altitude wheels directly to the main mirror box itself 2 long thinner screws with knob to connect the altitude wheels to the...

Page 5: ...ension and the red dot finder This foam insert also protects the main mirror during transit It also gives you the opportunity to store transport eyepieces or accessories Remove the insert and the prot...

Page 6: ...f holes Though the distance of the holes in the altitude wheels appears to be similar the orientation of the wheels on the mirror box DOES matter holes will not align if the altitude wheels are mounte...

Page 7: ...with an attachment point on the bottom of the secondary assembly The telescope is designed to have the focuser oriented on the right side so that the red dot finder is above the focuser when you move...

Page 8: ...mation screws that are located on the back side of the secondary mirror holder 2 Next check the reflection in the secondary mirror of the middle point of the main mirror which is marked by a tiny blac...

Page 9: ...ated on each side of the main mirror Figure 9 1 When you turn the collimation tool you will notice that the hexagonal head of the tool will lock into the hexagonal head of the collimation screw Now yo...

Page 10: ...Try turning the main mirror collimation screws when you are turning the correct screw in the proper direction you will notice that the distracting tail is getting shorter Figure 11 Remember to recente...

Page 11: ...ile the focuser is locked Turning the focuser knobs while the focuser is locked may result in damage to the focuser The telescope comes with two extension tubes 25mm and 20mm tall This is needed so th...

Page 12: ...bits the Sun you can observe the change of the light phases sickle half Venus full Venus very much like the phases of the moon The planetary disc of Venus appears white because the sunlight is reflect...

Page 13: ...light years away Found in the Taurus constellation it consists of more than 1 000 visual stars although an average of only six are visible to the naked eye A dark sky free of light pollution can help...

Page 14: ...exposure to a bright light even if it is a short exposure Use a dim light with a red filter to read star charts or draw objects dim red light does not influence your eye s adaption very much Horizon v...

Page 15: ...atic error correction and flatness of the field of view The maximum usable magnification is about two times the diameter of the aperture in millimeters However in nights of bad to average seeing much...

Page 16: ...ohol 99 Only use soft white unscented lotion free tissues to wipe optics Soak the primary mirror to dissolve the dirt and remove the fluid with short cautious strokes Remember to change tissues every...

Page 17: ...Trusses powder coated aluminum with connectors Secondary spider 4 arm steel Main mirror 10 inch 254 mm parabolic aluminum coated with protective layer 94 reflectivity Focal length 1270 mm Focal ratio...

Page 18: ...18 2019 Explore Scientific LLC 1010 S 48th Street Springdale AR 72762 explorescientificusa com exploreone com 866 252 3811 All rights reserved Made in China Contents and colors may vary...