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Operating Instructions

AR-90 · AR-102 · AR-127S/L · AR-152S/L· NT-130 · NT-150S/L · NT-203

Summary of Contents for AR-102

Page 1: ...Operating Instructions AR 90 AR 102 AR 127S L AR 152S L NT 130 NT 150S L NT 203...

Page 2: ...g 1a The Messier series telescope including a viewfinder Optical Assembly Newtonian model shown AR Achromatic Refractor NT Newton Reflectortelescope Technical Data Page 23 Fig 1c The Exos2 Tripod 3 3...

Page 3: ...nts See page 5 ff 2 3 3 3 3 WARNING Never use a Messier Series Telescope to look at the Sun Looking at or near the Sun will cause instant and irreversible damage to your eye Eye damage is often painle...

Page 4: ...mble 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...

Page 5: ...sighting scope with reticle that enables easy centering of objects in the telescope eyepiece 5 Viewfinder Collimation Screws Use these screws to adjust the alignment of the viewfinder 6 Viewfinder Fr...

Page 6: ...nt of the telescope when centering Polaris in the telescope eyepiece or when using the polar alignment viewfinder 28 Latitude Dial Set the latitude of the observing site on this dial using the latitud...

Page 7: ...tes for almost any topic relating to astronomy on the inter net Try the following key word searches NASA Hubble HST astronomy Messier satellite nebula black hole variable stars etc Check out Bresser s...

Page 8: ...the components from the packaging and familiarise yourself with them Please refer to illustrations 1a to 1d for details of telescope assembly When removing the tripod from its packaging keep it paral...

Page 9: ...T handle screws in order to move the mount until the pointer points to your latitude The two T handle screws EXOS 2 only work in a push pull operation as you tighten one loosen the other When the poi...

Page 10: ...prism s thumbscrews to a firm feel to secure the eyepiece 11 Adjust the height of the tripod Adjust the height of the tripod by loosening the tripod lock knobs Fig 11 Extend the sliding inner section...

Page 11: ...ow insert the plate illustration 4 C from above on the central screw Make sure the plate bars illustra tion 4 D show downwards Caution It s important the following step is applied to prevent thread da...

Page 12: ...roughly in the center of the cradle ring assembly Point the tube so that the front end this end comes shipped with the dust cover 9 Fig 1a over it is oriented as depicted in Fig 1a Then close the crad...

Page 13: ...is Most of the motion of the telescope takes place by moving about these two axes separately or simultaneously Try to become familiar with these locks and observe how the telescope moves on each axis...

Page 14: ...Tip Remove the viewfinder tube from the bracket to simplify this operation If the distant object is not in focus turn the focus lock ring counterclockwise to loosen the viewfinder front cell 6 Fig 1b...

Page 15: ...t 3 How are the craters on our Moon formed Is there water under the surface of the Moon 4 What is a black hole A neutron star A gamma burster An Einstein lens 5 What are stars made of Why are stars di...

Page 16: ...s The focal length of the 8 Messier series model is 900mm see Specifications page 23 24 Telescope Focal Length Eyepiece Focal Length Eyepiece Power Telescope Focal Length 1000mm Eyepiece Focal Length...

Page 17: ...turning one of the knobs of the focusing mechanism 8 Fig 1b Notice that when observing astronomical objects the field of view begins to slowly drift across the eyepiece field This motion is caused by...

Page 18: ...scope mount so that the pointer indicates the correct latitude of your viewing location on the latitude dial 28 Fig 1d See step 6 page 12 for more information 5 If steps 1 through 4 above were perform...

Page 19: ...th a solution of 3 parts distilled water to 1 part isopropyl alcohol You may also add 1 drop of biodegradable dishwashing soap per pint of solution Use soft white facial tissues and make short gentle...

Page 20: ...e primary mirror in equal amounts This offset is approximately 1 8 in each direction Note that these offsets have been performed at the factory prior to shipment of your telescope It is only necessary...

Page 21: ...were done correctly you will see concentric centered with respect to each other circles 1 Fig 32 An improperly collimated instrument will reveal oblong or elongated circles 2 Fig 32 Adjust the 3 coll...

Page 22: ...give complete error descriptions and specific information about the defective part The great majority of servicing issues can be resolved by telephone avoiding return of the telescope to the factory I...

Page 23: ...al design achromatic refractor Clear aperture 5 127 mm Focal length 635 mm or 1200 mm Focal ratio f 5 or f 9 5 Resolving power 0 9 arc sec Coatings multi coated Mount EXOS2 Aluminium Gu German type eq...

Page 24: ...Gu German type equatorial RA DEC drive system flexible shafts Max practical power 400x Tripod adjustable steel tube field tripod Net weight 25 1 kg AR 90 Achromatic Refractor with EXOS1 item number 47...

Page 25: ...Pole intersects the celestial sphere The North Star Polaris is located very near the North Celestial Pole The celestial equator 2 Fig 34 is a projection of the Earth s equator onto the celestial sphe...

Page 26: ...and reads in increments of 5min Using setting circles requires a developed technique When using the circles for the first time try hopping from one bright star the calibration star to another bright...

Page 27: ...nthusiasts with whom you will be able to share your discoveries Clubs are an excellent way to learn more about observing the sky to find out where the best observing sites are and to compare notes abo...

Page 28: ...ite is over 70 miles 110 km north of the listed city subtract one degree for every 70 miles If the site is over 70 miles South of the listed city add one degree per 70 miles EUROPE City Country Latitu...

Page 29: ...New Orleans Louisiana 30 N New York New York 41 N Oklahoma City Oklahoma 35 N Philadelphia Pennsylvania 40 N Phoenix Arizona 33 N Portland Oregon 46 N Richmond Virginia 37 N Salt Lake City Utah 41 N...

Page 30: ...the viewfinder s optical axis to the RA axis 1 Starting at the polar home position see p 18 loosen the Dec lock turn the Dec axis by 90 and re engage the Dec lock again In this position the optical ax...

Page 31: ...g circle to 0 and tighten the screw again In normal operation this screw should be loose N 7 d Now loosen the RA lock and turn the RA axis until the actual date at the month match with the local time...

Page 32: ...tem comes from observations made by amateur astronomers So as you look through your Bresser Messier Series telescope keep in mind Galileo To him a telescope was not merely a machine made of glass and...

Page 33: ...n night changes as they circle around the giant planet Saturn is nine times the diameter of Earth and appears as a small round disk with rings extending out from either side Fig 44 In 1610 Galileo the...

Page 34: ...which is part of the Ursa Major constellation It can be found the whole year through quite easily in Europe and Northern America If you draw a line on the sky which prolongs Big Dipper s handle back...

Page 35: ...in our local group Fig 48 Messier Tipps Star Charts Star charts and planisphere are very useful tools and are great aids in plan ning a night of celestial viewing A wide variety of star charts are av...

Page 36: ...Galaxy M31 Whirlpool Galaxy M51 Our sun 2 25 Mio light years 35 Mio light years Distances in space Fig 49 Moon Diameter 3 456 km Earth Diameter 12 664 km Distance between Planets The distance between...

Page 37: ...will cause instant and irreversible damage to your eye 37 Appendix E Star maps S W O Fig 50 Sky view Beginning of January ca 22 h Facing south N O W Fig 50a Sky view in winter Beginning of January ca...

Page 38: ...Appendix E Star maps 38 S W O Fig 51 Sky view in spring Beginning of April ca 22 h facing south N O W Abb 51a Sky view in spring Beginning of April ca 22 h facing north Spring...

Page 39: ...Appendix E Star maps 39 Summer S W O Fig 52 Sky view in summer Beginning of July ca 22 h facing south N O W Fig 52a Sky view in summer Beginning of July ca 22 h facing north...

Page 40: ...Appendix E Star maps 40 Autumn S W O Fig 53 Sky view in autumn Beginning of October ca 22 h facing south N O W Fig 53a Sky view in autumn Beginning of October ca 22 h facing north...

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Page 44: ...lated into another language in any form without written permission of the Bresser GmbH Errors and technical changes excepted Bresser GmbH Gutenbergstra e 2 DE 46414 Rhede Telefon 0 28 72 80 74 0 servi...

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