No category. The convex secondary mirror multiplies the effective focal length of the primary mirror and results in a focus at the focal plane, with light passing through a central perforation in the primary mirror. Note that light ray 2 in the figure would be lost entirely, except for the oversize primary. Field stops machined into the inside-diameter surface of the primary mirror baffle tube significantly increase lunar, planetary, and deep-space image contrast. These field stops effectively block off-axis stray light rays. Patent Office and in principal countries throughout the world.

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Quick Links. Download this manual. Instruction Manual. Table of Contents. Meade instruments telescope instruction manual lxd 75 68 pages. Meade instruments telescopes instruction manual lxd55 64 pages. Multi-mount telescope system with astronomer inside 72 pages. The convex secondary mirror multiplies the effective focal length of the primary mirror and results in a focus at the focal plane, with light passing through a central perforation in the primary mirror. Patent Office and in principal countries throughout the world.

Perform the telescope and AutoStar setup indoors in the light so that you become familiar with the parts and operation before moving the telescope outside into the dark for observing.

Handbox Port B. LED C. Auxiliary Ports 2 E. The LX90 telescope can be focused on objects from a distance of about 25 ft. Rotate the focus knob counterclockwise to focus on distant objects, and clockwise to focus on nearby objects. Page 8 If necessary, loosen the lock knob 1, Fig. A and place the clamp 2, Fig.

A on either one of the LX90 fork arm handles. Tighten the lock knob to a firm feel. Slide the AutoStar handbox into the holder 3, Fig. A and Fig B. You may also snap the handbox into the holder: Slide one side of the handbox into the holder and then firmly press the other side of the handbox into the holder until it snaps in place. Page 9: Autostar Features Fig.

Page 11 GO TO. Pressing GO TO again resumes the slew to the object. Arrow Keys: Slew the telescope in a specific direction up, down, left, and right , at any one of nine different speeds. Page Getting Started Getting the telescope ready for first observations requires only a few minutes. If these precautions are not followed, batteries may explode, catch fire, or leak.

Improperly installed batteries Battery void your Meade warranty. Always remove the batteries if they are not to be used Holder for a long period of time. Page Choosing An Eyepiece To calculate eyepiece power, divide the telescope's focal length by the eyepiece's focal length. For example, a 26mm eyepiece is supplied with the LX Unlock the R. Point the telescope at some well-defined and stationary land object at least yards dis- tant, such as the top of a telephone pole or street sign.

Page Observing Practice focusing objects with the focus knob 8, Fig. Once you get a feel for how your telescope moves and focuses, try to view something more This image inversion is challenging, like a bird or a distant moving train.

Page Slew Speeds Point your telescope at the Moon note that the Moon is not visible every night and practice rapidly moving. Children using the Arrow keys and the slew speeds to view different features. The Moon contains many should always have interesting features, including craters, mountain ranges, and fault lines. Page Astronomical Observing As the Earth rotates beneath the night sky, the stars appear to move from East to West.

The speed at which the stars move is called the sidereal rate. You can setup your telescope to move at the sidereal rate so that it automatically tracks the stars and other objects in the night sky. If the telescope is not tracking an astronomical object, the object will drift out of the eyepiece field of view.

Page Observe A Star Using Automatic Tracking see the margin Note to the left by default the first time you power it on, so you do not option of the Setup need to select this mode. Page Go To Saturn However, when the telescope slews to the first star, it may not appear in the field of view in the eyepiece. Use the SmartFinder 17, Fig. The alignment star will be easy to recognize—it will be the brightest star in the area of the sky where the telescope is pointing.

If your viewfinder and SmartFinder have been aligned with the telescope, the alignment star should now be in the eyepiece. Set the slew speed to 4 or less and center the star in the eyepiece. Press GO TO a second time to slew the telescope to that star. Use the Scroll keys to cycle through the list of stars in the constellation, from brightest to dimmest.

The available objects Remember, never use a telescope to look at the Sun! Lunar Eclipse lists upcoming Lunar Eclipses, including the date and type total, partial, penumbral of eclipse. Sleep Scope is a power saving option that shuts down AutoStar and the telescope without for- getting its alignment. Page Setup Menu Cord Wrap, when set to "On," moves the telescope in such a way as to prevent the cords and cables attached to your telescope assembly from getting wound around the assembly and tangled as the telescope slews to objects.

Page 29 AutoStar handbox. Software: Sends only the basic AutoStar software. This is useful if one user has downloaded a new version of AutoStar software from the Meade website www. Page Observing Satellites Satellite orbits change and new satellites including the Space Shuttle are launched. Visit the Meade web site www. If orbital parameters are more than one month old, the satellite pass may not happen at the time predicted by AutoStar.

Tour Modes The objects chosen for a tour list are selected from AutoStar's database or by entering the object's RA and Dec coordinates. Page 34 Writing a Tour Using the list of commands listed above, a custom tour can be created. The following is a list of command lines, complete with keywords and necessary strings: TITLE Title must be the first keyword in your tour after any comment lines and must be 15 characters AutoStar displays information about the asteroid from its database.

AutoStar displays information about the comet from its database. Page Landmarks In this procedure, you will store the location of terrestrial landmarks in AutoStar's memory.

Set the telescope in the home position, if necessary. Note for future reference where the telescope is located and if you have aligned the telescope, which alignment method is used. Page Identify In this procedure, you will center an object you wish to have identified by AutoStar in the telescope eyepiece and use the "Identify" menu to find out information about the object or the nearest object to it in the AutoStar database.

Page Browse Use the Scroll keys to scroll to a star on the list that you wish to align upon. Select a star that you can easily locate in the night sky. The telescope slews to the star.

Use the Arrow keys to move the telescope until the star is centered in the eyepiece. Photography through a long lens such as the LX90 requires special technique for good results, and the photographer should probably expect to waste a roll or two of film in acquiring this technique. The APM includes auxiliary connectors for plug-in of such accessories as corded models of illuminated reticle eyepieces, the Electric Focuser, or a CCD autoguider.

With this 25 ft. Page Maintenance If the LX90 is not to be used for an extended period, perhaps for one month or more, it is advisable to remove the batteries from the telescope. Page 44 Follow these steps for collimation of the optical system: The only adjustments possible, or necessary, on the LX90 are from the three screws Fig.

Page Specifications SmartFinder High accuracy, temperature-compensated Cast-aluminum, double-tine forks Gears Page Appendix A: Equatorial Polar Alignment In order to Polar align your telescope, it is essential to have an understanding of how and where to locate celestial objects as they move across the sky. This section provides a basic introduction to the terminology of Polar-aligned astronomy, and includes instructions for finding the celestial pole and for finding objects in the night sky using Declination and Right Ascension.

Setting Circles Setting circles included with the LX90 permit the location of faint celestial objects not easily found by direct visual observation. The Declination circle 11, Fig. Page Equatorial Wedge If you do not immediately see the object you are seeking, try searching the adjacent sky area.

Keep in mind that, with the 26mm eyepiece, the field of view of the LX90 is about 0. Because of its much wider field, the viewfinder may be of significant assistance in locating and centering objects, after the setting circles have been used to locate the approximate position of the object.

Page Precise Polar Alignment Declination corrections required is a direct function of the precision of polar alignment. Precise polar alignment requires the use of a crosshair eyepiece. Point the telescope, with the motor drive running, at a moderately bright star near where the meridian the North-South line passing through your local zenith and the celestial equator intersect.

To determine the latitude of an observing site not listed on the chart, locate the city closest to your site. Then follow the procedure below: Northern Hemisphere observers N : If the site is over 70 miles km North of the listed city, add one degree for every 70 miles.

Perform this procedure if you are experiencing any pointing accuracy problems. NOTE: Use a terrestrial object, such as a telephone pole or lamp post, to train the drive. You will need a new battery. Page Appendix E: Basic Astronomy In the early 17th century Italian Scientist Galileo, using a crude telescope considerably smaller than the LX90, turned it to look towards the sky instead of distant trees and mountains.


Meade LX90 Telescope User Manual



Meade LX90 User Manual


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