Assessments - 3, GPA: 3 ( )

Fabricante : Meade Arquivo Tamanho: 1.75 mb Arquivo Nome : Língua de Ensino:

Longer, non-standard set screws may protrude too far into the optical tube and cause serious damage to the telescope. (1) Bracket Slide (4) Collimation Screws (2) Objective Lens Cell (5) Eyepiece (3) Focus Locking Ring Fig. 6: 8x50mm Viewfinder b. Focusing the Viewfinder The 8x50mm viewfinder has been factory pre-focused to infinity. Should this focusing need adjustment for your eyes, loosen the knurled collar at the objective lens-end of the viewfinder (3, Fig. 6), enabling rotation of the objective lens cell (2, Fig. 6) forward or backward for precise focusing. Then tighten down the knurled collar against the objective lens cell to lock the focus in place. Note that no focusing is possible or necessary at the eyepiece end of the viewfinder. c. Collimating the Viewfinder The viewfinder will require alignment, or collimation, with the main telescope. Using the 26mm eyepiece, point the main telescope at some easy to find land object {e.g. the top of a telephone pole or corner of a building) at least 200 yards distant. Center a well-defined object in the main telescope. Then, turn the 6 nylon collimation thumbscrews (4, Fig. 6) until the crosshairs of the viewfinder are precisely centered on the object already centered in the main telescope. With this collimation accomplished, objects located first in the wide-field viewfinder will then be centered in the main telescope's field of view. 8. Attaching Diagonal and Eyepiece The #930 Diagonal Mirror (17, Fig. 4) slides into the focuser drawtube (15, Fig. 4) and, in turn, accepts the supplied 1 1/4" O.D. eyepiece. For astronomical observations, the diagonal mirror generally provides a more comfortable right-angle viewing position. Alternately, an eyepiece may be inserted directly into the focuser drawtube (using the diagonal mirror’s 1 1/4" adapter) for straight-through observations*. Note in this case, however, that the image will appear inverted and reversed left-for-right. With the diagonal mirror, telescopic images appear correctly oriented up-and-down, but still reversed left-for-right. For terrestrial applications, where a fully corrected image orientation is desired, both up-and-down and left-for-right, the optional #924 or #928** Erecting Prism (1 1/4" O.D.) should be ordered separately. Eyepieces and the diagonal mirror are held in their respective places on the telescope by a moderate tightening of the thumbscrews on the diagonal mirror. 9. Balancing the Telescope In order for the telescope to move smoothly on its mechanical axes, it must first be balanced, as follows: 1. Loosen the Right-Ascension (R.A.) lock (8, Fig. 4) and rotate the telescope so that the counterweight shaft (9, Fig. 5) is parallel to the ground (horizontal). 2. Loosen the counterweight lock lever(s) (7, Fig. 5) and slide the counterweight(s) along the shaft until the telescope remains in one position without tending to drift in either direction. Retighten the counterweight lock lever(s). 3. Loosen the Declination lock lever (5, Fig. 4) and rotate the optical tube assembly (OTA) so that the OTA is parallel with the ground (horizontal). 4. Loosen the two cradle ring lock knobs (16, Fig. 5) slightly and slide the OTA inside the cradle ring until the optical tube remains in one position without tending to fall in either direction. Retighten the cradle ring lock knobs, locking the OTA at this position. 5. The telescope is now properly balanced. * Note, however, that straight-through observing through a Meade ED apochromatic refractor may require an optionally-available extension tube, in order to reach correct focus. ** See the latest Meade General Catalog. - 15 - C. TELESCOPE OPERATION I.Your First Observations With the telescope assembled as described in Section B, and with the diagonal mirror and eyepiece in place, your are ready to make observations through the telescope. Even without the viewfinder (if not yet installed), terrestrial objects will be fairly easy to locate and center in the telescope’s field of view with a low power eyepiece, by “gunsighting” along the side of the main telescope tube. IMPORTANT NOTE: NEVER POINT THE TELESCOPE DIRECTLY AT OR NEAR THE SUN, OR ATTEMPT TO OBSERVE THE SUN, EITHER THROUGH THE MAIN TELESCOPE OF THE VIEWFINDER. INSTANT AND IRREVERSIBLE DAMAGE TO YOUR EYE MAY OTHERWISE RESULT! By unlocking the R.A. lock (8, Fig. 4), the telescope may be turned rapidly through wide angles in Right Ascension (R.A.). The reason for the terminology “Right Ascension” and its complementary term, “Declination” will be made clear further on in this manual. Fine adjustments in R.A. are made by turning the R.A. slow-motion knob (9, Fig. 4), while the R.A. lock is in the “locked” position. Releasing the Declination lock (5, Fig. 4), permits sweeping the telescope rapidly through wide angles in Declination. To use the Declination fine-adjust, or slow-motion control, lock the telescope in Declination using the Declination lock, and turn the Declin...

Baixe o seu

Para fazer o download, introduza 2 dígitos :