Celestron CGEM II 800 EdgeHD Telescopes EdgeHD Optics Manual
Celestron CGEM II 800 EdgeHD Telescopes Manual
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Celestron CGEM II 800 EdgeHD Telescopes manual content summary:
- Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 1
EdgeHD Series INSTRUCTION MANUAL EdgeHD 8 ● EdgeHD 9.25 ● EdgeHD 11 ● EdgeHD 14 - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 2
Never use your telescope to project an image of the sun onto any surface. Internal heat build-up can damage the telescope and any accessories F/10 23mm - 2" (122x) 9x50 90° - 2" with 1.25" adapter #91060-XLT EdgeHD 1400 356mm (14") EdgeHD Optics 3910mm F/10 23mm - 2" (170x) 9x50 90° - 2" with 1. - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 3
diverts the light at a right angle to the light path of the telescope. This allows you to observe in positions that are physically more comfortable 2. Attach the threaded ring of the 2" diagonal to the rear cell of the telescope. 3. Loosen the thumb screws on the side of the diagonal and remove the - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 4
, or ocular, is an optical element that magnifies the image focused by the telescope. The eyepiece fits into either the visual back directly (8" from the finderscope bracket. 2. Find the two holes in the rear cell of the telescope on the top left, when looking from the back of the tube. 3. Place - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 5
. To make the alignment process a little easier, you should perform this task in the daytime when it is easier to locate objects in the telescope without the finder. To align the finder: 1. Choose a conspicuous object that is in excess of one mile away. This will eliminate any possible parallax - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 6
or camera. Figure 2-1 A cutaway view of the light path of the EdgeHD optical design Image Orientation The image orientation changes depending on how the eyepiece is inserted into the telescope. When using the star diagonal, the image is right-side-up, but reversed from left-to-right (i.e., mirror - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 7
the image. To avoid this problem, your first astronomical target should be a bright object (like the Moon or a planet) so that the image is Support Clutches Although turning the focus knob should not damage the telescope, undue stress can be placed on the focus mechanisms causing excessive image - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 8
yards. The apparent field of each eyepiece that Celestron manufactures is found in the Celestron Accessory Catalog (#93685). General Observing Hints When your telescope. In most cases you will not be able to achieve a truly sharp image, while in some cases, you may actually see a double image. - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 9
way to begin recording celestial objects. It is done with the camera attached to the telescope without an eyepiece or camera lens in place. To attach your camera you need the Celestron T-Adapter (See Optional Accessories section) and a T-Ring for your specific camera (i.e., Canon, Nikon, etc.). The - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 10
telescope combination alone does not provide enough magnification to produce a usable image size on film. In order to get the image large enough, you must attach your camera to the telescope the object in the telescope's field based on the finder's view alone. Another problem introduced by the high - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 11
Find and center the desired target in the viewfinder of your camera. 2. Turn the focus knob until the image is as sharp as possible. 3. Place the black card over the front of the telescope. 4. Release the shutter using a cable release. 5. Wait for the vibration caused by releasing the shutter to - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 12
guide star. For this purpose, Celestron offers the Micro Guide Eyepiece (#94171) Here is a brief summary of the technique. 1. Polar align the telescope. For more information on polar aligning, see the Polar Alignment section earlier in the manual are best. Blurry pictures can also result from - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 13
Imaging Fastar Option - Using your EdgeHD telescope at f/2 with optional lens assembly The EdgeHD telescopes mirror (see Telescope Maintenance section of this manual). The F/# Fastar position, the system becomes f/2, this is a unique feature to some Celestron telescopes (see figures below). 13 - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 14
Fastar L ens Assem bly CCD Camera Figure 3-5 Figure 3-6 The key factors for good CCD imaging are; exposure time, field-of-view, image size, and pixel resolution. As the F-number goes down (or gets faster), the exposure times needed decreases, the field-of-view-increases, but the image Telescope - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 15
Celestron repair department. If your telescope is in need of internal cleaning, please call the factory for a return authorization number and price quote. Collimation The optical performance of your telescope have to manually track the star. Or, if you do not want to power up your telescope, you - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 16
2. Place your finger along the edge of the front cell of the telescope (be careful not to touch the corrector plate), pointing towards the collimation of a turn is enough to notice a change in collimation. If the star image moves out of the field of view in the direction that the central shadow is - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 17
above for the new direction. Perfect collimation will yield a star image very symmetrical just inside and outside of focus. In addition, perfect collimation delivers the optimal optical performance specifications that your telescope is built to achieve. If seeing (i.e., air steadiness) is turbulent - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 18
long and weighs only 4 oz. It works very well with all Celestron eyepieces. Erect Image Diagonal (#94112-A) - This accessory is an Amici prism arrangement that allows you to look into the telescope at a 45° angle with images that are oriented properly (upright and correct from left-to-right). It - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 19
quite easy. Second, the prism angle is tunable allowing you to look at guide stars on-axis. This accessory works especially well with the Reducer/Corrector. Skylight Filter (#93621) - The Skylight Filter is used on the Celestron telescope as a dust seal. The filter threads onto the rear cell of your - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 20
right to modify or discontinue, without prior notice to you, any model or style telescope. If warranty problems arise, or if you need assistance in using your telescope contact: Celestron Customer Service Department 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. (310) 328-9560 Fax. (310) 212 - Celestron CGEM II 800 EdgeHD Telescopes | EdgeHD Optics Manual - Page 21
Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. (310) 328-9560 Fax. (310) 212-5835 Web site at http//www.celestron.com Copyright 2009 Celestron All rights reserved. (Products or instructions may change without notice or obligation.) Item # 91030-INST $10.00 07-09
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INSTRUCTION MANUAL
EdgeHD 8
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EdgeHD 9.25
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EdgeHD 11
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EdgeHD 14