User manual CELESTRON ULTIMA 11 Instruction Manual

[. . . ] THE CELESTRON ULTIMA 91/4 AND ULTIMA 11 INSTRUCTION MANUAL Table of Contents INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 HOW TO USE THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 THE SCHMIDT-CASSEGRAIN OPTICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ASSEMBLING YOUR ULTIMA 91/4 AND 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Start the clock drive so that the mount tracks the star. You can consult a star catalog or use the list at the end of this manual. circle until the proper coordinates line up with the R. A. setting circle has a marker every six minutes with each hour labeled. 2. setting circle is now aligned and ready to use. As long as the drive is operating, the circle does not need to be reset once indexed to the correct coordinate (i. e. , once aligned). If the drive is ever turned off, then the R. A. setting circle must be reset once reactivated. Once you have finished this process you are ready to use the setting circles to locate objects in the night sky. See the section on "Using the Setting Circles, " for specific information. Ultima 91/4 and Ultima 11 Manual 37 USING THE DRIVE The Ultima drive is a state-of-the-art motor drive system designed specifically for the Ultima telescopes. The entire system is a self-contained unit built into the drive base. The clock drive is powered by a 9-volt rectangular battery which can run the telescope for up to 35 hours. The system can also run off of an AC power or external 12-volt DC power with optional adapters. The hand controller, which comes with the telescope, allows you to use the drive for astrophotography. The hand controller is NOT required for unguided visual observing. One of the most unique features of the new drive is the Periodic Error Correction (PEC) function. This feature allows the drive system to learn the characteristics of the worm gear and, as a result, improve the tracking. This typically reduces the periodic error to 30 percent or less of the original error. The amount of improvement will vary depending on guiding skill, atmospheric stability, the characteristics of the worm gear, and accuracy of the polar alignment. The following is a brief discussion of each of the features. Figure 5-1 Cover plate on the Ultima Drive Base POWERING UP THE DRIVE The `ON/OFF' switch supplies power to the drive motor. Each time the drive is turned on, it defaults to sidereal rate (i. e. , the rate at which the stars move across the sky). All LEDs illuminate, but the LED for the tracking rate selected is brighter than the others so it is discernible in the dark. [. . . ] The teleextender fits over the eyepiece onto the visual back. Vibration Suppression Pads (#93503) - These pads reduce the amplitude and vibration time of your telescope when shaken by the wind or an accidental bump. They rest between the ground and tripod feet of your telescope. VSPs are recommended for all observing conditions. [. . . ]