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manual abstract
Also, the accuracy of your polar alignment will affect how accurate your setting circles read. 2. The declination setting circle is factory set and should not need any adjustment if it reads accurately. 3. The right ascension setting circle must be aligned. Choose a bright and easy to find star in a star chart and note the coordinates (right ascension and declination). Find the star in the Star Pointer and then in the telescope. Now, rotate the right ascension circle to match the coordinates of the star with the indicator mark. If you polar aligned the telescope accurately, the declination circle should be correctly set to the proper coordinates. 4. The right ascension setting circle does not move as the telescope moves in right ascension and thus it must by aligned each time you want to use it to find a new object. However, you do not need to use a bright star each time but you can use the object you are currently observing. 5. Now, using a star chart or atlas you can find numerous objects. First move the telescope in declination to the correct declination coordinate. Then move the telescope in right ascension until the indicator points to the correct coordinate. 6. 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. Center the object in eyepiece. 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. Always start by using your lowest power eyepiece (20mm) then switching to higher power once you have found the desired object. 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 PowerSeeker 127 telescope has a focal length of 1000mm and comes with a 20mm 1." eyepiece. To calculate magnification, use the following formula, in which FL = focal length: Therefore, if you use the 20mm eyepiece your magnification is 1000/20 = 50x. The same formula can be applied to any of your eyepieces. Magnification through any telescope has its limits. These limits are determined by the laws of optics and the nature of the human eye. Most of your viewing will be done in the range of 50x to 130x. Higher powers are used mainly for lunar and sometimes planetary observing where you can greatly enlarge the image and the atmospheric conditions are near perfect. The images at extremely high powers magnify the image, but remember that the contrast will be very low due to the high magnification. For the brightest images with the most contrast, start by using the lower power eyepiece with a smaller image scale. The following magnification levels can be achieved when using the standard eyepieces in conjunction with the 3x Barlow lens: Rounded Rectangular Callout: Important! Text Box: FL (telescope) in mm FL (eyepiece) in mm Text Box: Magnification = Eyepiece Magnification Mag. with 3x Barlow Lens 20mm 50x 150x 4mm 250x 750x TELESCOPE MAINTENANCE With proper care, your telescope should rarely need any maintenance work. To maintain your telescope in the best possible condition, observe the follow suggestions: 1. When your telescope isn’t in use, replace all lens covers to keep dust and contaminants off the optical surfaces. 2. A small amount of dust on any optical surface isn’t a problem and doesn’t need to be removed. If the dust builds up, then use a can of compressed air and a camels hair brush to remove the dust. To remove fingerprints or other contaminants, use an optical cleaning kit or the Celestron Lens Pen (#93575). 3. If the inside of the objective lens needs cleaning, it should be done by a professional. Either have your instrument serviced by a telescope repair facility or return it to the factory for servicing. ollimation Collimation or alignment of the optical system is done at the factory before shipment. 1. If your telescope has received very rough handling during transport or is dropped, it may need collimation. Refer to the following sketch to check if your telescope is in collimation. If you look into the eyepiece adapter (without an eyepiece) at the top of the focuser, this is what you should see. If the reflection of your eye is off center, then collimation is necessary. 2. Adjustments to the collimation of the telescope can be made by turning the collimation adjustment screws (d) located at the rear of the optical tube. 3. If your telescope is out of collimation, the best way to re- collimate it is with a good collimation tool. Celestron offers a Newtonian Collimation Tool (#94183) with detailed instructions that make it an easy chore. SPECIFICATIONS PowerSeeker 127 Aperture 127mm Focal Length 1000mm Focal Ratio f/8 Mounting Equatorial Tripod Adjustable Aluminum Tripod NOTE: Specifications are subject to change without notice. Optional Accessories Celestron offers a full line of optional accessories for ...