User manual BUSHNELL NORTHSTAR ATS 78-7846

[. . . ] #: 91-0216/03-01 AUTOMATED TRACKING SYSTEM 78-7876 76mm RefLECtor Instruction Manual 78-7846 114mm RefLECtor 2. WHERE DO I START? Your Bushnell telescope can bring the wonders of the universe to your eye. While this manual is intended to assist you in the set-up and basic use of this instrument, it does not cover everything you might like to know about astronomy. Although Northstar will give a respectable tour of the night sky, it is recommended you obtain a very simple star chart and a flashlight with a red bulb or red cellophane over the end. For objects other than stars and constellations, a basic guide to astronomy is a must. [. . . ] Using the 20 mm lens, a sample calculation would look like this: 750 mm / 20mm = 38x or 38 power. Telescope models will vary in focal length). Included with this telescope is a Barlow lens. Barlow lenses are used to double or triple the power of your telescope. Place your Barlow between the focusing tube and the eyepiece. 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. 38 power x 3 = 114 power. 2. Focusing Telescope 1. 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. Look through Main Telescope Tube and establish a well-defined target. (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. Look up the latitude of your area in any geographical atlas. 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. [. . . ] At higher magnifications especially, you will notice that the moon or Jupiter will "race" right out of the field of view. To compensate, just move your telescope to "track" it in the necessary path. 14. M HELPFUL HINTS 1. Your telescope is a very sensitive instrument. For best results and fewer vibrations set your telescope up on a level location on the ground rather than your concrete driveway or your wooden deck. [. . . ]