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indicator is between the 18h 50m mark and the 19h 00m mark on the R.A. setting circle. 3. Lock the R.A. clamp to hold the telescope in place. 4. Move the telescope in R.A. using the slow motion control handle until the three on the vernier scale lines up with one of the marks on the R.A. setting circle. Remember, the R.A. indicator must stay between the 18h 50m mark and the 19h 00m mark on the R.A. setting circle! 5. Look through the telescope and the Ring Nebula should be within the field of view if you are using a low power eyepiece (assuming you have already set the DEC). Telescope Maintenance With proper care your telescope should rarely need any maintenance work. 1. When not in use, always replace all lens covers to keep dust and contaminants off the optical surfaces. 2. A small amount of dust on any optical surface is OK. If the dust builds up then use a can of compressed air and then a camel's hair brush to remove the dust. 3. If the mirrors or lenses need cleaning, they should be cleaned by a professional. Either have your instrument serviced by a telescope repair facility or return it to the factory. 4. Collimation or alignment of the optical system is done at the factory before shipment. Collimation (for the #31027 and #31056 only) 1. If your telescope has received very rough handling during transport or is dropped, it may need collimation. To check if your telescope is in collimation the sketch below will help you. If you look into the eyepiece adapter (without an eyepiece), this is what you should see. If the reflection of your eye is off center, then collimation is necessary. 2. If your telescope is out of collimation, it can be re-collimated by loosening the three Phillips head screws located on the rear cell of the telescope tube and adjusting the three knurled knobs until the secondary mirror is centered in the reflection of the primary mirror. The best way to re-collimate is with a good collimation tool. Celestron offers a Newtonian Collimation Tool (#94183) with detailed instructions that make it an easy chore. Technical Specifications C80-HD (#21077) C102-HD C114-HD C150-HD (#21016) (#31027) (#31056) Optical System: Achromat Achromat Newtonian Newtonian Refractor Refractor Reflector Reflector Coating: Fully Multi-Coated Fully Multi-Multi Coated Multi Coated Coated Aperture: 80mm 102mm 114mm 150mm Focal Length: 900mm 1000mm 900mm 1000mm F/ratio: f/11 f/10 f/8 F/7 Magnification (with standard eyepiece) 45x 50x 45x 50x Highest Useful Power Magnification: 189x 241x 269x 354x Resolution in arc seconds (Dawes) 1.45 1.14 1.02 0.77 Light Gathering Power: 131 212 265 459 Limiting Visual Magnitude: 12 12.5 13 13.5 Angular Field of View: 1.1° 1° 1.1° 1° Linear Field of View (at 1000 yds.) 57’ 53’ 57' 53’ Optical Tube Length: 35" 38.5" 35" 19.25” Weight Optical Tube: 6 lbs. 8.0 lbs. 6 lbs. 13 lbs. Equatorial Mount (with counterweight): 23 lbs. 28 lbs. 28 lbs. 28 lbs. Note: All specifications are using the standard accessories. These specifications are approximate and subject to change without notice. OPTIONAL ACCESSORIES Celestron International offers a wide assortment of optional accessories to expand your interests. Sky Maps (#93722) - Invaluable when learning the night sky. They include all the constellations with the brighter deep-sky objects. On the front cover is a rotating planisphere which indicates when specific constellations are visible. Flashlight - LED (#93588) - Uses red LED's to allow reading star maps and locating telescope accessories and controls without ruining you night vision. 15 Motor Drive (#93517) - This single-axis unit runs off D-cell batteries. It compensates for the Earth's rotation keeping celestial objects centered in the field of view. This makes observing much more enjoyable as it eliminates the constant usage of the slow motion controls. A dual-axis model (#93522) is also available. Eyepieces - A whole assortment of various sizes of 1 - 1/4" eyepieces are available to give you a wide range of magnifications. Eyepiece filters - A line of filters are available for 1-1/4" eyepieces to enhance your visual observations of the Moon and planets. Collimation Tool for Newtonians (#94183) - A helpful aid to collimating your telescope. Provided is a simple tool and detailed instructions. Polar Axis Finderscope (#94221) – This useful accessory helps speeds accurate polar alignment by using an etched reticle for finding the North Celestial Pole. T-Adapters - Allows you to take short exposure photos of the Moon. It requires a 35mm SLR camera and a T-Ring for your brand of camera. Other - Numerous other accessories are available. See the Celestron Accessory Catalog (#93685) or ask your Celestron dealer for details. CELESTRON TWO YEAR WARRANTY A. 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...

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