User manual BUSHNELL NORTHSTAR ATS 78-7876

[. . . ] Most noted features are its dark stripes or bands both above and below its equator. Look at different times of the year and try to catch a glimpse of the white polar ice caps. Venus--Just like the moon, Venus changed phases from month to month. Some views of brilliant Venus appear as if you were looking at a distant crescent moon. Nebulae--The Great Orion Nebula is a very well known night sky object. [. . . ] Using the example above, your 3x Barlow lens would give you a total power of 114x or 114 power. The magnification calculation would look like this: 750 mm/ 20mm =38 power. After selecting the desired eyepiece, aim main telescope tube at a land-based target at least 200 yards away (e. g. Fully extend focusing tube by turning Rack and Pinion Focusing Mechanism. While looking through selected eyepiece (in this case the 20 mm), slowly retract focusing tube by turning Rack and Pinion Focusing Mechanism until object comes into focus. 2. (see Focusing Telescope section) Looking through Wide Field Finderscope, alternate tightening each Finderscope Adjustment Screw until crosshairs of Wide Field Finderscope are precisely centered on the same object already centered in Main Telescope Tube's field of view. Now, objects located first with the Wide Field Finderscope will be centered in the field of view of the main telescope. 2. 3. a Never Look Directly At The Sun Wi t h Your Telescope Permanent Damage To Your Eyes May Occur 9. HOW TO USE YOUR NEW TELESCOPE (CONTINUED) Understanding the Equatorial Mount The Equatorial Mount is designed to move in any direction. It can be set to allow manual controls to track the movements of celestial bodies across the sky. This is referred to as diurnal movement: movement of celestial bodies in the direction opposite to that of the earth's rotation and around the earth's axis. By aligning the telescope's polar axis at celestial North, you will place the telescope in parallel with the earth's axis and thus be able to locate stars in the sky based on star atlas information. Loosen the Declination Lock Knob and rotate the telescope around the declination axis until the arrow on the declination scale points to 90 degrees. Loosen the Latitude Lock Knob and set the latitude scale to the correct latitude for your area. You will probably notice that Polaris is not dead center in the Finderscope's field of view. This is probably because your telescope is not absolutely level with the ground. Loosen the Horizontal Axis Lock Knob again and turn the telescope so that it is directly aimed at Polaris. Therefore, the sighting of stars will have to be slightly adjusted as you locate them in the heavens. 2. LATITUDE N EARTH'S AXIS (CELESTIAL AXIS) N POLAR AXIS S S POLAR AXIS & EARTH'S AXIS 10. Parts Diagrams 78-7876 76mm Reflector Telescope Parts Diagram 1. Right ascension axis shaft 11. Parts Diagrams (Continued) 78-7846 114mm Reflector Telescope Parts Diagram 1. Right ascension axis shaft 12. AUTOMATED TRACKING SYSTEM INSTALLATION 1. Please note your telescope model number and refer to the appropriate diagram. Using the fine adjustment cable, rotate shaft until the flat side of shaft is visible through the opening in the side of the plastic adapter. Using the fine adjustment cable, rotate shaft until the flat side of the gear coupler cavity matches the position of the flat side of the Automated Tracking System shaft. Make certain the notches of the plastic adapter and the notches on the backside of the Automated Tracking System (ATS) securely interface. [. . . ] (Note: If objects high in the sky are distorted or wavy, you are probably viewing on a very humid night. ) During nights of unstable atmosphere, viewing through a telescope can be frustrating if not impossible. Astronomers refer to crisp, clear nights as nights of "good seeing. " 15. WARRANTY / REPAIR TELESCOPE LIFETIME LIMITED WARRANTY Your Bushnell® telescope is warranted to be free of defects in materials and workmanship for the lifetime of the original owner. The Lifetime Limited Warranty is an expression of our confidence in the materials and mechanical workmanship of our products and is your assurance of a lifetime of dependable service. If your telescope contains electrical components the electronic components are warranted to be free of defects in materials and workmanship for one year after the date of purchase. [. . . ]