Bresser AR-90 Operating Instructions Manual
  1. Manuals
  2. Brands
  3. Bresser Manuals
  4. Telescope
  5. AR-90
  6. Operating instructions manual

Bresser AR-90 Operating Instructions Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

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

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the AR-90 and is the answer not in the manual?

Questions and answers

Related Manuals for Bresser AR-90

Summary of Contents for Bresser AR-90

  • Page 1 Operating Instructions AR-90 · AR-102 · AR-127S/L · AR-152S/L· NT-130 · NT-150S/L · NT-203...
  • Page 2 eneral nformatIons elescope eatures Fig. 1a: The Messier series telescope including a viewfinder. Optical Assembly (Newtonian model shown). 3& Fig. 1c: The Exos1 Tripod 3& Achromatic Refractor - Newton - Reflectortelescope Technical Data Page 23! Fig. 1c: The Exos2 Tripod...
  • Page 3 eneral nformatIons elescope eatures 1&  2& 1&  Fig. 1d, top: The Messier series mount EXOS2 2& Fig. 1d, left: The Messier series mount EXOS1 Explanations of the points See page 5 ff 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.

  • Page 4: Table Of Contents

    Description of the features ............5 Technical Data AR-102, AR-127 S/L und AR-152 S/L ..23 Assembling (Exos 1) Technical Data NT-150 S/L, NT-203, AR-90 und NT-130 ... 22 Telescope Assembly ............8 Appendix A: Celestial coordinates ........25   How to Assemble Your Telescope   ........8 Locating the Celestial Pole ..........

  • Page 5: Messier Series: Your Personal Window To The Universe

    elescope eatures Messier series: Your personal window to the universe The Messier series models are versatile, high-resolution telescopes. The Messier series models offer unmatched mechanical performance. The Messier series telescopes reveal nature in an ever-expanding level of detail. Observe the feather structure of an eagle from 150 yards or study the rings of the planet Saturn from a distance of 800 million miles.
  • Page 6 elescope eatures the focuser assembly. For normal observing with an eyepiece and diago- nal prism, it is not necessary to use the lock knob. 17 Dec. Lock: Controls the manual movement of the telescope. Turning the Dec. lock counterclockwise unlocks the telescope enabling it to be freely Important: 1&...
  • Page 7 Sun in 1998,astronomers around the world posted new photos daily. You can find websites for almost any topic relating to astronomy on the inter- net. Try the following key word searches: NASA, Hubble, HST,   a stronomy,  Messier, satellite, nebula, black hole, variable stars, etc. Check out Bresser’s website for the latest product and technical   i nformation.  You’ll find our website at: http://www.bresser.de/ Here are some other sites you might find interesting: • Sky & Telescope: ...

  • Page 8: Assembling (Exos1)

    ssemblInG Assembling (Exos1) Telescope Assembly As you unpack your telescope, carefully note the following parts. The assembly is shipped in separate boxes. • Equatorial mount with polar alignment finder •   H eavy duty, adjustable steel tube tripod with leg braces, three tripod leg  lock knobs, and a captive mount locking knob •   C omplete optical tube assembly including primary mirror with dust cover  and a rack-and-pinion focuser and eyepiece holders for both 1.25“ and 2“  eyepiece holders, tube cradle assembly with two rings and two lock knobs • Eyepiece •  ...
  • Page 9 ssemblInG 5. Fastening the counterweight on the counterweight rod: insert the base of the counterweight rod (20, illustration 1d) on the threaded end of the rod and screw it on the counterweight rod (22, illustration 1). Then screw both in the thread on the base of the declination axis and counter screw rod to base.
  • Page 10 ssemblInG 9. Attach viewfinder bracket (Abb. 9b). Locate the viewfinder bracket screws (15, Fig. 1b and Fig. 9a) and remove the nuts from the screws. Slide the holes in the viewfinder bracket over the viewfinder bracket screws. Replace the nuts and tighten to a firm feel only. 9a.

  • Page 11: Assembling (Exos2)

    ssemblInG Assembling (Exos2) Telescope Assembly As you unpack your telescope, carefully note the following parts. The assem- bly is shipped in separate boxes. • Equatorial mount with polar alignment finder •   H eavy duty, adjustable steel tube tripod with leg braces, three tripod leg  Fig. 3: The tripod lock knobs, and a captive mount locking knob •   C omplete optical tube assembly including primary mirror with dust cover  and a rack-and-pinion focuser and eyepiece holders for both 1.25“ and 2“ ...
  • Page 12 ssemblInG it disappear in its drill hole and reveal the hole. If it doesn‘t, carefully  DEC-setting circle loosen the counterweight screw until the bolt moves. Remove the safety Shaft base cover (23, illustration 1d) from the rod. Hold the counterweight firmly  Lock knob whilst moving it to about the middle of the counterweight rod (22, illustra- tion 1d). Tighten the counterweight fastening screw and then replace the safety cover.

  • Page 13: First Steps

    Irst teps NOTE: Eyepiece Two eyepiece holders are included with your EXOS2-NT-telescope - for both 1.25”  and 2” eyepieces. To change eyepiece holders, unscrew the attached holder from  the focuser and thread on the other holder. Viewfinder Holder 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 of each tripod leg to the desired length;...

  • Page 14: Aligning The Viewfinder

    Irst teps  Aligning the Viewfinder  The wide field of view of the telescope‘s viewfinder (4, Fig. 1a) provides  an easier way to initially sight objects than the main telescope‘s   e yepiece  (3, Fig. 1a), which has a much narrower field of view. If you have not already attached the viewfinder to the telescope tube assembly, follow the procedure described in step 9, page 9. Isolation pad In order for the viewfinder to be useful, it must be aligned to the main  ...

  • Page 15: Choosing An Eyepiece

    Irst teps ATTENTION: Collimation screws Eyepiece Never point the telescope directly at or near the Sun at any time! Observing the Sun, even for the smallest fraction of a second, will result in instant and irreversible eye damage, as well as physical damage to the telescope itself. 6.
  • Page 16 Irst teps A telescope’s eyepiece magnifies the image formed by the telescope’s  main optics. Each eyepiece has a focal length, expressed in millimeters, or “mm.” The smaller the focal length, the higher the magnification. For exam- ple, an eyepiece with a focal length of 9mm has a higher magnification than an eyepiece with a focal length of 25mm. Your telescope comes supplied with a Plössl 25mm eyepiece which gives a wide, comfortable field of view with high image resolution.

  • Page 17: Observation

    bservatIon Observation Important Note: Observing by Moving the Telescope Manually Objects appear upside-down After the telescope is assembled and balanced as described previously, and reversed left- for-right when you are ready to begin manual observations. View easy-to-find terrestrial observed in the viewfinder. With objects such as street signs or traffic lights to become accustomed to the refracting tele scope models, functions and operations of the telescope.

  • Page 18: Setting The Polar Home Position

    bservatIon Setting the Polar Home Position 1. Level the mount, if necessary, by adjusting the length of the three tripod legs. North Point optical Point optical 2. Unlock the R.A. Lock (33, Fig. 1d). Rotate the Optical Tube Assembly tube to north tube to north until the counterweight shaft is pointing straight down over the mount.

  • Page 19: Maintenance

    aIntenance and ervIce Maintenance Messier series telescopes are precision optical instruments designed to yield a lifetime of rewarding applications. Given the care and respect due  any precision instrument, your Messier will rarely, if ever, require factory servicing. Maintenance guidelines include: a.   A void cleaning the telescope’s optics: A little dust on the front surface of  the telescope’s correcting lens causes virtually no degradation of image  quality and should not be considered reason to clean the lens. b.

  • Page 20: Alignment (Collimation) Of The Newtonian Optical System

    Alignment (Collimation) of the Newtonian Optical System All Bresser Newtonian telescopes are precisely collimated at the factory  before packing and shipment, and it is probable that you will not need to make any optical adjustments before making observations. However, if  Note: the telescope sustained rough handling in shipment, you may need to re- collimate the optical system. Such re-collimation is not a difficult procedure The AR-(refractor) models do not in any case.

  • Page 21: Inspecting The Optics

    aIntenance and ervIce IMPORTANT NOTE: Do not force the 4 screws past their normal travel, and do not rotate any screw or screws more than 2 full turns in a counterclockwise direction (i.e., not more than 2 full turns in their „loosening“ direction), or else the   d iagonal  mirror may become loosened from its support. Note that the diagonal mirror collimation adjustments are very sensitive: generally turning a collimation screw 1/2-turn will have a dramatic effect on collimation.

  • Page 22: Customer Service

    Customer Service If you have a question concerning your Messier series telescope, contact NOTE: the Bresser Customer Service Department.  The production registration form is In the improbable case of a malfunction, please contact first the Bresser  on page 42. Please fill it out and customer service before sending back the telescope. Please give complete return it to Bresser. This is a con-...

  • Page 23: Technical Data Ar-102, Ar-127 S/L Und Ar-152 S/L

    echnIcal AR-102 Achromatic refractor with EXOS 2 item number 47-02108 Optical design achromatic refractor Clear aperture  4” = 102 mm Focal length 1000 mm Focal ratio f/10 Resolving power 1.11 arc sec Coatings multi coated Mount EXOS2  Aluminium-Guß, German type equatorial RA + DEC drive system flexible shafts Max.
  • Page 24 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 EXOS 1 item number 47-90907 Optical design achromatic refractor Clear aperture  3,5” = 90 mm Focal length 900 mm...

  • Page 25: Appendix A: Celestial Coordinates

    a: c ppendIx elestIal coordInates Appendix A: Celestial coordinates For a sufficient tracking of an celestial object, the telescope mount has to be aligned with the celestial pole. By doing this, the mount’s axes are orientated in this way that they fit  to the celesial sphere. If you want to align the telescope’s mount to the celestial pole, you  need some knowledge in which way an object at the sky can be located while it is steadily moving across the sphere.

  • Page 26: Locating The Celestial Pole

    a: c ppendIx elestIal coordInates Every celestial object can be exactly determined by these coordinates. Using setting circles prerequisites an advanced observing technique. If you use them for the first time, first point a bright star (the guide star) with known coordinates and adjust the setting circles to them. Now you can do a “star hop” to the next star with known coorditates and ...
  • Page 27 a: c ppendIx elestIal coordInates Messier Tips Join an Astronomy Club. Attend a Star Party One of the best ways to increase your knowledge of astronomy is to join an astronomy club. Check your local newspaper, school, library, or telescope dealer/store to find out if there’s a club in your area. At club meetings, you will meet other astronomy and Meade enthusiasts with whom you will be able to share your discoveries.

  • Page 28: Appendix B: Latitude Chart

    b: l ppendIx atItude hart Appendix B: Latitude Chart Latitude Chart for Major Cities of the World To aid in the polar alignment procedure (see page 25), latitudes of major cities around the world are listed below. To determine the latitude of an observing site not listed on the chart, locate the city closest to your site.
  • Page 29 b: l ppendIx atItude hart UNITED STATES OF AMERICA City Country Latitude Albuquerque New Mexico 35° N Anchorage Alaska 61° N Atlanta  Georgia  34° N Boston  Massachusetts  42° N Chicago Illinois 42° N Cleveland Ohio 41° N Dallas Texas 33° N Denver Colorado 40°...

  • Page 30: Appendix C: Polar Alignment

    c: p ppendIx olar lIGnment Appendix C: Polar Alignment Reticle LED knob The Polar Alignment Viewfinder Normally, a rough alignment with the celestial pole is sufficient for visual Eyepiece purposes. However, for those observers who need to meet the more  demanding requirements of astrophotography, the polar alignment viewfinder allows the telescope mount to be more precisely aligned with true North.
  • Page 31 c: p ppendIx olar lIGnment Observers on the northern hemishere: N- 7 a) Determine the rough longitude of your observing site (example: Munich is 12° E). Now determine the longitude of the time meridian according to your local time. For the central european time, this is 15° E (do not use daylight savings).

  • Page 32: Appendix D: Basic Astronomy

    Much of the knowledge we have on subjects such as comets, meteor showers, double and variable stars, the Moon, and our solar system comes from observations Fig. 43: The giant planet, Jupiter.  made by amateur astronomers. So as you look through your Bresser  The four largest moons can be Messier-Series telescope, keep in mind Galileo. To him, a   t elescope was not  observed in a different position merely a machine made of glass and metal, but  ...
  • Page 33 d: b ppendIx asIc astronomy Twelve Apollo astronauts left their bootprints on the Moon in the late 1960‘s  and early 1970‘s. However, no telescope on Earth is able to see these foot- prints or any other artifacts. In fact, the smallest lunar features that may be seen with the largest telescope on Earth are about one-half mile across. Planets Planets change positions in the sky as they orbit around the Sun. To locate the planets on a given day or month, consult a monthly astronomy magazine, such as Sky and Telescope or Astronomy.
  • Page 34 d: b ppendIx asIc astronomy Constellations are large, imaginary patterns of stars believed by ancient civ- ilizations to be the celestial equivalent of objects, animals, people, or gods. These patterns are too large to be seen through a telescope. To learn the constellations, start with an easy grouping of stars, such as the Big Dipper ...
  • Page 35 d: b ppendIx asIc astronomy Fig. 47: The Andromeda Galaxy  (M31), the biggest one 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 avail- able in books, in magazines, on the internet and on CD Roms.
  • Page 36 d: b ppendIx asIc astronomy Distances in space Distance between Earth and Moon  383.000 km / 240’000 mi Earth Moon Diameter = 12’664 km Diameter = 3’456 km Distance between Planets The distance between the Sun and our Earth is 150’000’000 km / 93’750’000 mi or 1 AU (Astronomical unit) Mercury Venus Earth Mars Distance to the sun = 0.39 AU Distance to the sun = 0.72 AU Distance to the sun = 1.00 AU Distance to the sun = 1.52 AU Pluto has a very excentric orbit that brings him sometimes inside the orbit of Neptune...

  • Page 37: Appendix E: Star Maps

    e: s ppendIx tar maps Winter Fig. 50: Sky view (Beginning of January,  ca. 22 h), Facing south Fig. 50a:   S ky view in winter (Beginning of <January, ca. 22 h), facing north Looking at or near the Sun will cause instant and irreversible damage to your eye!
  • Page 38 e: s ppendIx tar maps Spring Fig. 51:   S ky view in spring (Beginning of April,  ca. 22 h), facing south Abb. 51a:   S ky view in spring (Beginning of April,  ca. 22 h), facing north...
  • Page 39 e: s ppendIx tar maps Summer Fig. 52:   S ky view in summer (Beginning of July,  ca. 22 h), facing south Fig. 52a:       S ky view in summer (Beginning of July  ca. 22 h), facing north...
  • Page 40 e: s ppendIx tar maps Autumn Fig. 53:   S ky view in autumn (Beginning of October,  ca. 22 h), facing south Fig. 53a:   S ky view in autumn (Beginning of October,  ca. 22 h), facing north...
  • Page 44 Bresser GmbH Gutenbergstraße 2 • DE-46414 Rhede Telefon: (0 28 72) 80 74 0 Besuchen Sie uns auf • Find us on: service.apd@bresser.de • www.bresser.de ANLMESSIERGB0114BRESSER...

This manual is also suitable for:

Ar-127sAr-102Ar-152sAr-127lAr-152lNt-130 ... Show all

Table of Contents

Save PDF