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IMPORTANT NOTE:
•  All Bresser telescopes and accessories are under constant technical advancement. Slight changes of the product specifications, 
which serve the improvement of the product, are reserved for this reason.
•  No part of this manual may be reproduced, sent, transferred or be translated into another language in any form without written 
permission of the Meade Instruments Europe GmbH & CO. KG. Errors and technical changes excepted.
•  Please keep this guidance at hand for further looking up.
®  The name „Bresser“ and the Bresser Logo are registered trademarks. „Messier“ is a trademark of the Meade Instruments Europe GmbH 
& Co. KG.
© 2013 Meade Instruments Europe GmbH & Co. KG, Germany
Chapter Page
Messier series: Your personal
window to the universe ........................................................ 5
Description of the features
....................................................... 5
Assembling (Exos 1)
Telescope Assembly ........................................................... 8
How to Assemble Your Telescope ..................................... 8
Assembling (Exos 2)
Telescope Assembly ......................................................... 11
How to Assemble Your Telescope .................................... 11
First Steps
Balancing the Telescope  .................................................. 13
Aligning the Viewfinder ..................................................... 14
Choosing an Eyepiece .......................................................16
Observation ......................................................................... 17
Observing by Moving the Telescope Manually ................. 17
Observe the Moon ............................................................ 17
Setting the Polar Home Position ....................................... 18
Maintenance ........................................................................ 19
Maintenance guidelines ....................................................... 19
Alignment (Collimation)
of the Newtonian Optical System ..................................... 20
Chapter Page
Inspecting the Optics ........................................................... 21
Customer Service ................................................................ 22
Technical Data AR-102, AR-127 S/L und AR-152 S/L ......... 23
Technical Data NT-150 S/L, NT-203, AR-90 und NT-130 ... 22
Appendix A: Celestial coordinates ....................................... 25
Locating the Celestial Pole .................................................. 26
Setting Circles ..................................................................... 26
To use the setting circles to locate an object
not easily found by direct visual observation .................... 26
Appendix B: Latitude Chart  ................................................. 28
Appendix C: Polar Alignment .............................................. 30
Adjusting the polar viewfinder ............................................. 30
Polar alignment
by using the polar viewfinder (Exos 2 only) ....................... 30
Appendix D: Basic astronomy  ............................................. 32
Appendix E: Star maps ....................................................... 37
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