Assessments - 3, GPA: 3.3
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Facilidade de uso
Screw) P. Tripod Head G. Finderscope Q. Tripod Legs H. Tube Ring Adjustment Knob (hidden) - (not shown) R. Tripod Feet 1. Optical Window S. Clamp Lock — Vertical Adjustment J. Thumbscrew 2 1. INTRODUCTION Thank you for purchasing this Celestron 76mm (3") Tabletop Telescope. This telescope is a precision scientific instrument. With it you will enjoy numerous objects in the sky—planets, nebulae, star clusters, galaxies and other astronomical objects. The altazimuth mount is the simplest and easiest type of mount to use with two motions — altitude (up and down) and azimuth (side-to-side). But, before your journey begins take time to read this manual to familiarize yourself with the operation and parts of your telescope. WARNING—NEVER LOOK AT THE SUN WITH YOUR TELESCOPE OR ITS FINDERSCOPE. PERMANENT AND IRREVERSIBLE EYE DAMAGE MAY RESULT AS WELL AS DAMAGE TO YOUR TELESCOPE. 2. TELESCOPE ASSEMBLY Please refer to Figure 1 (and the identifying parts list) as you assemble the telescope. The telescope and all items are packed in one box. Included are: Model #31034 ® Telescope Optical Tube ® Table Tripod Mount ® Tripod Legs (3) ® 5x24 Finderscope and Bracket ® 4mm Eyepiece - .96" (150x) ® 20mm Eyepiece - .96" (30x) © Barlow Lens - 2x - .96" A. Remove the telescope tube, table tripod arm and tripod head from the box. These parts are assembled at the factory: 1. Take the tripod legs (Q) out of the box. Attach the three tripod legs by threading them clockwise into the threaded holes in the tripod head (P). 2. Rubber feet (R) are already installed on the.tripod legs to prevent any damage from the metal • tripod legs when set on a table or other flat surface. B. Mounting the finderscope: 1. Remove the finderscope assembly (finderscope and bracket) from the box. 2. The finderscope with bracket (G) mounts in a socket on the telescope tube. Slide the finderscope bracket into the groove of the socket on the telescope and hold it in place by tightening the thumbscrew (J) firmly. C. Mounting the eyepiece: 1. Take the low power (20mm) eyepiece (A) from the box and remove it from the plastic vial. 2. Remove the plug up cap from the eyepiece holder (B). 3. Insert the eyepiece into the eyepiece holder and hold in place with the thumbscrews (C). 3. TELESCOPE OPERATION — GETTING SET UP A. To move the telescope in azimuth (side-to-side): 1. Loosen the clamp lock (O). 2. Hold a tripod leg (Q) and slowly rotate the telescope by turning the table tripod telescope arm (N) to the desired location. 3. Lock the clamp lock (0). B. To move the telescope in altitude (up-down): 1. Loosen the clamp lock (S). 2. Hold the rear housing (M) and slowly rotate the telescope to the desired location. 3. Lock the clamp lock (S). C. To rotate the telescope tube: 1. Loosen the tube ring adjustment knob (H). 2. Rotate the telescope tube slowly by turning the optical window cell (I) to the desired location. 3. Tighten the tube ring adjustment knob (H). D. To focus the telescope and align the finderscope: 1. Remove the front lens cap (I). 2. With a low power eyepiece tight in the eyepiece adapter, position the telescope tube to look at any object about one mile or further away during the day. Put the object in the center of the field. To focus, turn the focusing knob (D) until your chosen object is in sharp focus. Remember to use outdoors only as you should not look through windows which may distort the image. 3. Look through the fmderscope. If the object being observed is not visible in tfye finderscope or is not in the center of the fmderscope crosshairs, then you need to align the finderscope. Use the finderscope adjustment screws (F) to align the fmderscope with the main telescope by tightening and loosening these screws until the object is centered on the crosshairs. Once the fmderscope is aligned with the main telescope, it makes it easy to find celestial objects. You find the desired object in the fmderscope first (since it has a wide field) and then look at the narrow field but much more powerful main telescope for detailed views. 4. If the image in the fmderscope is not sharp, then turn the fmderscope eyepiece (E) until the image is sharp. 5. Do not be alarmed when you look through the telescope and the object is upside down and reversed left to right (the finderscope will only be reversed left to right). This is normal with an astronomical telescope. 4 4. UNDERSTANDING THE SKY A. The Celestial - Coordinate System. The celestial-coordinate system is an imaginary projection of the Earth's geographical coordinate system onto the celestial sphere which seems to turn overhead at night. This celestial grid is complete with equator, latitudes, longitudes and poles. The Earth is in constant motion as it rotates on its axis. Actually the celestial-coordinate system is being displaced very slowly with respect to the stars. This is called precession and is caused by gravitational influences from the Sun, ...