INSTRUCTION MANUAL

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$orionÂ® Eonâ¢ apochromatic ED refractors$

5 6 Catalog Keys Object List TOUR Button Press the TOUR button on the hand control. The hand control will display the first object that is currently visible. Press INFO to read information about the object displayed. Press the DOWN scroll key to display the next object. Press ENTER to slew to (go to) the displayed object. There are three methods for selecting objects to view: 1) Press one of the Catalog buttons and enter the number of the object you want to view (i.e. M042). 2) Press the LIST button and scroll through one of the many lists of named stars and objects. 3) Press TOUR and let the NexStar display a list of all the best objects that are currently in the sky. 32
A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused. Some telescopes, known as refractors, use lenses. Other telescopes, known as reflectors, use mirrors. The Schmidt-Cassegrain optical system (or Schmidt-Cass for short) uses a combination of mirrors and lenses and is referred to as a compound or catadioptric telescope. This unique design offers large-diameter optics while maintaining very short tube lengths, making them extremely portable. The Schmidt-Cassegrain system consists of a zero power corrector plate, a spherical primary mirror, and a secondary mirror. Once light rays enter the optical system, they travel the length of the optical tube three times. Figure 6-1 A cutaway view of the light path of the Schmidt-Cassegrain optical design The optics of the NexStar have Starbright coatings - enhanced multi-layer coatings on the primary and secondary mirrors for increased reflectivity and a fully coated corrector for the finest anti-reflection characteristics. Inside the optical tube, a black tube extends out from the center hole in the primary mirror. This is the primary baffle tube and it prevents stray light from passing through to the eyepiece or camera. 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., reverted). If inserting the eyepiece directly into the visual back (i.e., without the star diagonal), the image is upside-down and reversed from left-to-right (i.e., inverted). This is normal for the Schmidt-Cassegrain design. Actual image orientation as seen with the unaided eye Reversed from left to right, as viewed with a Star Diagonal Inverted image, as viewed with the eyepiece directly in telescope Figure 6-2 33
Page 1 and 2: ® INSTRUCTION MANUAL 1 NexStar 5i
Page 3 and 4: TELESCOPE BASICS...................
Page 5 and 6: 10 1 2 3 9 4 8 5 7 6 Figure 1-A - T
Page 7 and 8: 5 in 7 Direction Buttons Focus Knob
Page 9 and 10: The Hand Control The hand control i
Page 11 and 12: 1. To turn on the Star Pointer, rot
Page 13 and 14: 5 1 2 4 3 Figure 4-1 The NexStar El
Page 15 and 16: 2. Press the STAR button on the han
Page 17 and 18: Your NexStar i-Series telescope is
Page 19 and 20: Alignment Procedures In order for t
Page 21 and 22: Helpful Hint 4. NexStar then asks y
Page 23 and 24: aligning your scope. For more infor
Page 25 and 26: Direction Buttons The NexStar has f
Page 27 and 28: To replace the contents of any of t
Page 29 and 30: Wedge Align - The NexStar has two e
Page 31: 1 2 APPENDIX C LONGITUDE LATITUDE d
Page 35 and 36: distance of one thousand yards. The
Page 37 and 38: Motion of the Stars The daily motio
Page 39 and 40: Finding the North Celestial Pole In
Page 41 and 42: Observing the Sun Although overlook
Page 43 and 44: After looking at the night sky for
Page 45 and 46: eady for your next shot. Keep in mi
Page 47 and 48: Terrestrial Photography Your NexSta
Page 49 and 50: To verify collimation, view a star
Page 51 and 52: You will find that additional acces
Page 53 and 54: top or side of the telescope, makin
Page 55 and 56: APPENDIX A - TECHNICAL SPECIFICATIO
Page 57 and 58: Appendix B - Glossary of Terms A- A
Page 59 and 60: Right Ascension: (RA) resolution. t
Page 61 and 62: LONGITUDE LATITUDE degrees min degr
Page 63 and 64: LONGITUDE LATITUDE degrees min degr
Page 65 and 66: Appendix D - RS-232 Connection (for
Page 74 and 75: CELESTRON ONE YEAR WARRANTY A. Cele

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