Meade LX90 Observing By Moving the Telescope Manually, Terrestrial Observing

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IMPORTANT NOTE:

Objects appear upside-down and reversed left-for-right when observed in the eyepiece when insert- ed directly into the (straight-through) eye- piece holder – with the diagonal prism in place, images will be right-side-up, but reversed left-for-right.

This image inversion is of no consequence when observing astronomical objects and, in fact, all astro- nomical telescopes yield inverted images.

During terrestrial observing, where a fully-correctly-oriented image (right-side-up and correct left-for- right) is desirable, an optional #928 45° Erecting Prism is available. See

“OPTIONAL ACCESSORIES,” page 41.

OBSERVING

Observing By Moving the Telescope Manually

If you wish to observe a distant land object, such as a mountain top or a bird, you can observe by merely pointing the telescope and looking through the eyepiece.

1.Loosen the telescope’s R.A. lock (9, Fig. 1) and Dec lock (6, Fig. 1).

2.Move your telescope to observe distant street signs, mountains, trees, and other structures. Use SmartFinder and/or the viewfinder to to help site-in on an object.

3.Center the object with SmartFinder’s red dot and then in the telescope eyepiece. When the object is centered in your eyepiece, remember to re-tighten the R.A. and Dec locks.

4.Practice focusing objects with the focus knob (8, Fig. 1).

5.Once you get a feel for how your telescope moves and focuses, try to view something more challenging, like a bird or a distant moving train.

NOTE: Viewing conditions vary widely from night-to-night and site-to-site. Turbulence in the air, even on an apparently clear night, can distort images. Low- power eyepieces, such as the Super Plössl 26mm supplied with your telescope, are better suited to resolving images in poor viewing conditions.

You can also observe stars and objects in the night sky using this method, but note that objects begin to slowly drift across the eyepiece field. This motion is caused by the rotation of the Earth. As you become familiar with the AutoStar handbox operation, you can counteract the drift using the automatic tracking feature in the AutoStar Setup menu (see "TO TRACK AN OBJECT AUTOMATICALLY," page 18), or by using AutoStar's GO TO capabilities (see "GO TO SATURN," page 20).

Terrestrial Observing

The LX90 ia an excellent high-resolution, terrestrial (land) telescopes. Viewing terrestrial objects requires looking along the Earth's surface through heat waves. These heat waves often cause degradation of image quality. Lower power eyepieces, like the Super Plössl 26mm eyepiece, magnify these heat waves less than higher power eyepieces. Therefore, lower power eyepieces provide a steadier, higher quality image. If the image is fuzzy or ill-defined, reduce to a lower power eyepiece, where the heat waves do not have such an effect on image quality. Observing in early morning hours, before the ground has built up internal heat, produces better viewing conditions than during late afternoon hours.

Observing Using AutoStar's Arrow Keys

You may observe land and astronomical objects using AutoStar's Arrow keys to move the telescope.

1. Tighten the Dec and R.A. locks (6 and 9, Fig. 1).

Fig. 8a & 8b: Jupiter: Examples of the right amount of magnification and too much magnification.

LX90 TIPS

Too Much Power?

Can you ever have too much power? If the type of power you’re referring to is eyepiece magnification, yes, you can! The most common mistake of the beginning observer is to “overpower” a telescope by using high magnifications which the telescope and atmospheric conditions cannot reasonably support. Keep in mind that a smaller, but bright and well-resolved image is far superior to one that is larger, but dim and poorly resolved (see Figs. 8a and 8b). Powers above 400X should be employed only under the steadiest atmospheric conditions.

AutoStar can calculate the best eyepiece for you to use. Try out the “Eyepiece Calc” feature in the Utilities menu.

Most observers should have three or four additional eyepieces to achieve the full range of reasonable magnifications possible with the LX90 telescopes. See OPTIONAL ACCESSORIES, page 41.

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Contents LX90 Schmidt-Cassegrain Telescope Meade Schmidt-Cassegrain Optical System Contents QUICK-START Guide ON/OFF Telescope Features E DPage To Attach the Handbox Holder Autostar Features Tour the Cosmos with Just the Push of a ButtonTopmost screen Select Item Object Page How to Attach the Tripod to the Telescope Assembly Getting StartedHow to Assemble Your Telescope Precautionary notes for the tripodUsing SmartFinder Choosing an EyepieceAligning SmartFinder Aligning the ViewfinderObserving Using AutoStars Arrow Keys ObservingObserving By Moving the Telescope Manually Terrestrial ObservingSlew Speeds Observe the MoonAstronomical Observing To Track an Object AutomaticallyMoving Through AutoStar’s Menus Initializing AutoStar for the First TimeObserve a Star using the Automatic Tracking Feature How to perform the Automatic Alignment procedureAutomatic Alignment While it does soUsing the Guided Tour Go To SaturnBasic Autostar Operation AutoStar Navigation ExerciseNavigating AutoStar Entering Data into AutoStarTo Calculate Sunset time AUTOSTAR’S Menus Select Item ObjectMenus and Menu Options Object MenuGlossary Menu Event MenuUtilities Menu Observing Considerations Setup Menu Time Zone Shift Menu Daylight SAVING, Advanced Autostar Features Adding Observing SitesTo Add a Site to the user-defined site list To Edit a SiteUsing AutoStar to Find Objects Not in the Database Observing Satellites To GO to a user-entered objectHow to Create Your Own Guided Tour Command LineWhat you will need Tour ModesWriting a Tour TitlePick END Landmarks Downloading ToursTo Add a landmark to the database To Select a landmark from the databaseIdentify Advanced Alt/Az AlignmentTo perform a Landmark Survey To check on the available amount of memory in AutoStarTwo-Star Alt/Az Alignment BrowseOne-Star Alt/Az Alignment Few tips on photography with the LX90 Photography with the LX90Photography with a Digital Camera Photography with Meade’s AutoStar Suite Meade Deep Sky ImagerOptional Accessories Eyepiece Power 2x Barlow Super Plössl 4-elementsSuper Wide Angle 6-elements Ultra Wide Angle 8-elements#62 T-Adapter Maintenance CollimationPage Inspecting the Optics Meade Customer ServiceGauging the Movement of the Telescope AutoStar Specifications LX90 SpecificationsAutoStar Dimensions Polar Alignment Celestial CoordinatesSetting Circles Locating the Celestial PoleAutoStar Polar Alignment Easy Polar AlignmentLining Up with the Celestial Pole Equatorial WedgePrecise Polar Alignment Star Charts Latitude Chart for Major Cities of the World City State/Prov./Country LatitudeCity Country Latitude City State/Country LatitudeAppendix C Training the Drive Appendix D Changing the LNT Module Battery To replace the batteryObjects in Space AutoStar GlossaryMoon Planets Deep-Sky ObjectsPage Page Page Meade Limited Warranty