User manual CELESTRON FIRSTSCOPE 60 AZ REFRACTORS

[. . . ] FIRSTSCOPE 60 AZ REFRACTORS MODELS #21052 FIRSTSCOPE 70 AZ REFRACTOR MODEL #21071 INSTRUCTION MANUAL 2 INTRODUCTION Congratulations on your purchase and welcome to the Celestron world of amateur astronomy. Some of the terms and parts described in these instructions may be new to you, so a few commonly used terms you'll want to be familiar with are defined below. Altazimuth mount - the simplest type of mount, with two motions: altitude (up and down) and azimuth (side-toside). "Mount" refers to the part of the telescope that support the tube, which carries all the telescope's optics. [. . . ] Loosen the altitude locks on the sides of the telescope tube and the silver azimuth lock on the base of altazimuth mount, then move the telescope in the desired direction. Look through the Star Pointer finderscope and pan the telescope until the object appears in the field of view. To center the object with the red dot in the Star Pointer, use the fine adjustment ring on the altitude slow motion rod assembly. Focusing 1. Once you have found an object in the telescope, turn the focusing knob until the image is sharp. To focus on an object that is nearer than your current target, turn the focusing knob toward the eyepiece (i. e. , so that the focusing tube moves away from the front of the telescope). For more distant objects, turn the focusing knob in the opposite direction. To achieve a truly sharp focus, never look through glass windows or across objects that produce heat waves, such as asphalt parking lots. Image Orientation 1. When observing with a diagonal, the image will be right side up, but reversed from left to right. When observing straight through, with the eyepiece inserted directly into the telescope, the image will be inverted. Also, the image in the finderscope is inverted. MAGNIFICATION The magnification (or power) of a telescope varies depending upon the focal length of the eyepiece being used and the focal length of the telescope. The Firstscope telescope has a focal length of 700mm and comes with a 20mm 1¼" eyepiece. To calculate magnification, use the following formula, in which FL = focal length: Magnification = FL (telescope) in mm FL (eyepiece) in mm 6 Therefore, if you use the 20mm eyepiece your magnification is 700/20 = 35x. Celestron offers numerous optional eyepieces to expand your range of magnification. In general, 1¼" eyepieces are of a higher optical quality and give you sharper images, along with a wider field of view and better eye relief. These limits are determined by the laws of optics and the nature of the human eye. The maximum usable power (with sharp images) is equal to 60 times the aperture of the telescope (in inches). So, with a 60mm telescope it has a maximum useful power of 144x (2. 4" x 60) and with the 70mm the maximum is 165x (2. 7559 x 60). Higher powers are used mainly for lunar and sometimes planetary observing where you can greatly enlarge the image. The images at extremely high powers like 675x magnify the image bur remember that the contrast will be very low and the image somewhat blurred due to the super power. Most astronomy publications indicate where the planets are in the sky each month. 7 The drawing of Jupiter provides a good representation of what you can expect to see with moderate magnification, during good "seeing" conditions. Observing the Sun Although overlooked by many amateur astronomers, solar observation is both rewarding and fun. However, because the sun is so bright, special precautions must be taken when observing this star, so as not to damage your eyes or your telescope. [. . . ] Celestron warrants this telescope to be free from defects in materials and workmanship for two years. Celestron will repair or replace such product or part thereof which, upon inspection by Celestron, is found to be defective in materials or workmanship. As a condition to the obligation of Celestron to repair or replace such product, the product must be returned to Celestron together with proof-of-purchase satisfactory to Celestron. The Proper Return Authorization Number must be obtained from Celestron in advance of return. [. . . ]