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When unsteady air conditions prevail (as witnessed by rapid “twinkling” of the stars), extremely high-power eyepieces result in poor magnification, where the object detail observed is actually reduced by the excessive power. – 12 – MAINTENANCE Cleaning As with any quality instrument, lens or mirror surfaces should be cleaned as infrequently as possible. Front surface aluminized mirrors, in particular, should be cleaned only when absolutely necessary. In all cases avoid touching any mirror surface. A little dust on the surface of a mirror or lens causes negligible loss of performance and should not be considered reason to clean the surface. When lens or mirror cleaning does become necessary, use a camel’s hair brush or compressed air gently to remove dust. If the telescope’s dust cover is replaced after each observing session, cleaning of the optics will rarely be required. Mount and Tripod Adjustments Every Meade 114 EQ-DS equatorial mount and tripod is factory inspected for proper fit and function prior to shipment. The tripod legs have wingnuts (39, Fig. 1c), and Phillips-head screws (38, Fig. 1c) that may have backed off. They may be tightened to a firm feel for a more sturdy performance of the telescope. Collimation (Alignment) of the Optics All Meade 114 EQ-DS telescopes are optically aligned at the factory prior to shipment. It is unlikely that you will need to align, or collimate, the optics after receipt of the instrument. However, if the telescope received unusually rough handling in shipment, it is possible that the optics must be re aligned for best optical performance. In any case this alignment procedure is simple, and requires only a few minutes the very first time the telescope is used. Take the time to familiarize yourself with the following collimation procedure, so that you will recognize a properly collimated instrument and can adjust the collimation yourself, if necessary. a. Correct collimation The properly collimated (aligned) mirror system in the Meade 114 EQ-DS assures the sharpest images possible. This occurs when the primary mirror and diagonal mirror are tilted so that the focused image (see Fig. 4) falls directly through the center of the focuser drawtube (17, Fig. 1b). These mirror tilt adjustments are made with the diagonal assembly (Fig. 5) and the primary mirror cell (Fig. 6), and will be discussed later. To inspect the view of the mirror collimation, look down the focuser drawtube with the eyepiece removed. The edge of the focuser drawtube (1, Fig. 7), will frame the reflections of the primary mirror with the 3 mirror clips (2, Fig. 7), the diagonal mirror (3, Fig. 7) , the spider vanes (4, Fig. 7), and your eye (5, Fig. 7). Properly aligned, all of these reflections will appear concentric (i.e., centered) as illustrated in Fig. 7. Any deviation from the concentric reflections will require adjustments to the diagonal assembly (Fig. 5), and/or the primary mirror cell (Fig. 6). b. Diagonal holder adjustments If the diagonal mirror (1, Fig. 8) is centered in the drawtube (2, Fig. 8), but the primary mirror is only partially visible in the reflection (3, Fig. 8), the 3 Phillips-head diagonal tilt screws (1, Fig. 5). Note: To adjust these screws you must first remove an adhesive backing) must be unthreaded slightly to the point of where you can tilt the diagonal holder (3, Fig. 5) from side-to-side by grasping the diagonal holder with your hand and tilt until you see the primary mirror become as centered in the reflection of the diagonal mirror as possible. Once you are at the best position, thread in the 3 Phillips-head diagonal tilt screws to lock the rotational Diagonale Diagonal Assembly Diagonal Mirror Focused Image imairePrimary Mirror Promary Mirror-Tilt Screws Fig. 4: The Newtonian Reflecting Telescope. – 13 – position. Then, if necessary, make adjustments to these 3 Phillips-head screws to refine the tilt-angle of the diagonal mirror until the entire primary mirror can be seen centered within the diagonal mirror reflection. When the diagonal mirror is correctly aligned, it will look like Fig. 9. (Note: the primary mirror is shown out of alignment.) c. Primary mirror adjustments If the diagonal mirror (1, Fig. 9) and the reflection of the primary mirror (2, Fig. 9) appear centered within the drawtube (3, Fig. 9), but the reflection of your eye and the reflection of the diagonal mirror (4, Fig. 9) appear off- center, you will need to adjust the primary mirror tilt Phillips-head screws of the primary mirror cell (3, Fig. 6). These primary tilt screws are located behind the primary mirror, at the lower end of the main tube. See Fig. 4. To adjust the primary mirror tilt screws, first unscrew several turns, the 3 hex-head primary mirror cell locking screws (2, Fig.6) that are next to each primary mirror tilt Phillips- head screw. Then by trial-and-error, turn the primary mirror tilt Phillips-head screws (3, Fig. 6) until you develop a feel for which way to turn each screw to c...