User manual CELESTRON 500 MM SPOTTING SCOPE

[. . . ] Before embarking upon an exploration of the sky, please take time to read this manual and familiarize yourself with both the parts and operation of your telescope. WARNING NEVER LOOK DIRECTLY AT THE SUN WITH THE NAKED EYE OR WITH A TELESCOPE. NEVER POINT YOUR TELESCOPE AT THE SUN UNLESS YOU ARE USING THE PROPER SOLAR FILTER. NEVER USE YOUR TELESCOPE TO PROJECT AN IMAGE OF THE SUN ONTO ANY SURFACE. [. . . ] The star pointer is powered by a long life 3-volt lithium battery (#CR2032) located underneath the front portion of the Star Pointer. Like all finderscopes, the Star Pointer must be properly aligned with the main telescope before it can be used. This is a simple process using the azimuth and altitude control knobs located on the side and bottom of the Star Pointer. The alignment procedure is best done at night since the LED dot will be difficult to see during the day. To turn on the Star Pointer, rotate the variable brightness control clockwise until you here a "click". To increase the brightness level of the red dot, continue rotating the control knob about 180º until it stops. Locate a bright star or planet and center it in a low power eyepiece in the main telescope. With both eyes open, look through the glass window at the alignment star. If the Star Pointer is perfectly aligned, you will see the red LED dot overlap the alignment star. If the Star Pointer is not aligned, take notice of where the red dot is relative to the bright star. Right ascension hours are also divided into minutes of arc and seconds of arc, with each hour having 60 minutes of arc and each arc minute being divided into 60 arc seconds. After moving the telescope to the correct celestial coordinates, look through the lower power eyepiece to see if you have located the object you wish to view. If the object is not visible in the eyepiece, gradually pan the telescope, using the right ascension and declination cables, until the object is visible. 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 60 telescope has a focal length of 900mm 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 Therefore, if you use the 20mm eyepiece your magnification is 900/20 = 45x. 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 80mm telescope it has a maximum useful power of 189x (3. 15" 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. [. . . ] This useful guide also includes beautiful constellation paintings, photographs, and clear, concise descriptions of stars, the planets, the sun, the moon, comets, black holes, galaxies and more. Planisphere (#93720) - A colorful rotating star map that indicates when specific constellations are visible, with removable markers for tracking the movement of planets. Available in three different latitudes: 30°, 40°, and 50° all ±10°. A full description of all Celestron accessories can be found in the Celestron Accessory Catalog (#93685). 16 CELESTRON TWO YEAR WARRANTY A. [. . . ]