Gebruiksaanwijzing /service van het product ETX-105EC van de fabrikant Meade
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Meade Instruments Corporation Instruction Manual ETX-90EC Astr o T elescope ETX-105EC Astr o T elescope ETX-125EC Astr o T elescope.
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Quick-Start Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 T elescope Electronic Contr oller Functions . . . . . . . . . 5 ETX: Y our Personal Window on the Universe . . . . . . .6 T elescope Controls . . . . . . . . . . . . . . . .
Remove the ETX from its packaging and place it on a sturdy surface. Place the eyepiece ( A ) and viewfinder ( B ) into their appropriate positions on the telescope and tighten their respective attachment screws to a firm feel only .
- 5 - 1 2 9 5 11 10 6 (on left fork arm) 16 4 19 13 15 7 3 20 Fig. 1: The ETX-90EC Astro T elescope. Features of the ETX-90EC, ETX- 105EC, and ETX-125EC are identical, with the exception of the size of optical tube and the type of viewfinder inc luded as standard equipment.
- 6 - ETX: Y our Per sonal Window to the Universe The Meade ETX-90EC, ETX-105EC, and the ETX-125EC are extremely versatile, high-resolution telescopes with features similar to those once available only with larger and more specialized imaging systems.
- 7 - Computer Control P anel A. ON / OFF Switch - T urns the Computer Control Panel and Electronic Controller ON or OFF . Note: Always remove the batteries if they are not to be used for a long period of time.
Electronic Contr oller Functions Fig. 3: Electronic Controller . (1) Arrow Keys; (2) Indicator Lights; (3) SPEED Key; (4) Coil Cord; (5) MODE Key; (6) OUT Key; (7) IN Key .
- 9 - GETTING ST ARTED P ar ts List ETX telescopes are assembled virtually complete at the Meade factory . Getting the telescope ready for first observations requires only a few minutes. When first opening the packing box, note carefully the following parts: • The ETX Astro T elescope with fork- mount system.
- 10 - Using The Viewfinder As with most astronomical telescopes, the ETX model telescopes present a fairly narrow field of view to the observer . As a result it is sometimes difficult to locate and center objects in the telescope ’ s field of view .
- 11 - 2. Point the main telescope at some easy-to-find, well-defined land object, such as the top of a telephone pole. Center the object, as precisely as possible, in the SP 26mm eyepiece's field of view , then tighten the vertical and horizontal locks ( 6 and 9, Fig.
- 12 - Understanding Magnification The magnification, or power , at which a telescope is operating is determined by two factors: the f ocal length of the telescope and the focal length of the ey epiece employ ed. T elescope Focal Length is the distance that light travels inside the telescope before reaching a focus.
- 13 - morning hours, before the ground has built up internal heat, results in better viewing conditions than during the late- afternoon hours. 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.
- 14 - Light 1 (top LED): The fastest speed. Use to move the telescope quickly from one point in the sky to another . Light 2: Best for centering an object in the viewfinder. Light 3: Best for centering an object in the field of a low-to-moderate power eyepiece, such as the standard SP 26mm.
- 15 - applications and for casual astronomical observation. The telescope may be placed on a rigid tabletop or on the optional Meade #883 Deluxe Field T ripod (see OPTIONAL ACCESSORIES , page 20) to provide a secure, variable-height, altazimuth observing platform.
- 16 - configuration the observer does not need to press the Arrow keys of the Electronic Controller in order to track celestial objects. However , the Arrow keys of the Electronic Controller are usef.
- 17 - There are two mounting methods available to polar align the telescope depending on whether you use the optional #883 Deluxe Field T ripod or a table tripod (specific to your model of ETX telescope). T o polar align using the #883 Deluxe Field T ripod ( Fig.
- 18 - and horizontal locks. In this orientation the telescope ’ s optical tube is lined up parallel to the tripod ’ s adjustable leg. 8. Note the line and arrow extending from the telescope tube in Fig. 16 . This line defines the telescope ’ s polar axis .
- 19 - Format 2 utilizes both sections of the #64 T -Adapter threaded together to form a rigid unit. In this configuration there is no field vignetting: images are illuminated to the edges of a standard 35mm frame (see Fig. 20 ). T o frame an object in the viewfinder of the 35mm camera body , slightly loosen the knurled attachment ring ( 3, Fig.
- 20 - OPTIONAL ACCESSORIES A wide assortment of professional Meade accessories are available for the for ETX telescopes. Meade accessories greatly extend many important applications to the telescope, from low-power , wide-field terrestrial viewing to high-power lunar and planetary observing.
- 21 - # 825 8 x 25 mm Right-Angle Viewfinder: Included as standard-equipment on ETX-105EC and ETX-125EC models, the 8 x 25mm Right-Angle Viewfinder ( Fig. 25 ) permits a comfortable 90 ° viewing position with 90mm ETX models as well. The #825 fits into the same bracket as the 8x21mm viewfinder supplied with ETX-90EC telescopes.
- 22 - GENERAL MAINTENANCE Y our ETX model telescope is a precision optical instruments designed to yield a lifetime of rewarding observations. Given the care and respect due any precision instrument, the telescope will rarely require factory servicing or maintenance.
- 23 - Inspecting the Optics A Note About the “ Flashlight T est:" If a flashlight or other high-intensity light source is pointed down the main telescope tube, the view (depending upon the obs.
- 24 - • If inside a warm house or building, move outside. Interior air conditions may distort terrestrial or celestial images, making it difficult, if not impossible, to obtain a sharp focus. For optimal viewing, use the telescope outside in the open air instead of observing through an open or closed window or screen.
- 25 - Specifications: ETX-90EC Astro T elescope Optical design . . . . . . . . . . . . . . . . . . . Maksutov-Cassegrain Primary mirror diameter . . . . . . . . . . . . . . . . . . 96mm (3.78 ” ) Clear aperture . . . . . . . . . . . . . . . . . . .
Appendix A: AD V ANCED ELECTRONIC CONTROLLER FUNCTIONS T racking Motor Speeds In the polar mode the Electronic Controller normally tracks objects at the sidereal rate (see SIDEREAL RA TE , page 13). For most observing sessions (once the telescope has been polar aligned and the tracking motor activated), there is little need to change this speed.
Appendix B: HELPFUL CHARTS Latitude Chart for Major Cities of the W orld T o aid in the polar alignment procedure (see page 16), latitudes of major cities around the world are listed below . T o determine the latitude of an observing site not listed on the chart, locate the city closest to your site.
Appendix C: PRECISE POLAR ALIGNMENT ; SETTING CIRCLES If desired, you may obtain more precise polar alignment by first accomplishing basic polar alignment as detailed in POLAR ALIGNMENT PROCEDURE , page 16, then returning to this procedure: Note: This procedure mov es the telescope ph ysically to line up precisely with the celestial pole.
- 29 - OBJECTS IN SP A CE In the early 17th century , Italian Scientist Galileo, using a crude telescope considerably smaller than the ETX-90EC, turned it to look towards the sky instead of distant trees and mountains. What he saw , and what he realized about what he saw , forever changed the way mankind thinks of the universe.
- 30 - Jupiter ( Fig. 34 ) is the largest planet in our solar system, with a diameter 1 1 times that of Earth. Jupiter appears as a disk with dark lines stretching across the surface.
MEADE LIMITED W ARRANTY Every Meade telescope, spotting scope, and telescope accessory is warranted by Meade Instruments Corporation ( “ Meade ” ) to be free of defects in materials and workmanship for a period of ONE YEAR from the date of original purchase in the U.
V er . 0501 Part no. 14-1010-20 AD V ANCED PR ODUCTS DIVISION Meade Instruments Corporation World’ s Leading Manuf acturer of Astronomical T elescopes for the Serious Amateur 6001 Oak Canyon, Irvine, California 92618 ■ (949) 451-1450 F AX: (949) 451-1460 ■ www .
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