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Orion 8958 manual

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Table of contents for the manual

  • Page 1

    INSTRUCTION MANUAL IN 361 Rev . A 9/09 Customer Support (800 ) 676 -1 343 • E-mail: suppor t@telescope.com Corporate Offices (831) 763-7000 • 89 Hangar W ay , W atsonville, CA 95076 Orion ® Ritchey-Chrétien Astr ographs #8956 6" f/9 Ritchey-Chrétien Optical T ube Assembly #8958 8" f/8 Ritchey-Chrétien Optical T ube Assembly Provid[...]

  • Page 2

    2 Congratulations on your purchase of an Orion Ritchey-Chrétien astrograph! Astroimaging demands high contrast and center to edge image shar pness. The Ritchey-Chrétien optical sys - tem f eatures precision hyperbolic mirrors with an impressiv e reflectivity rat ing of no less than 94%. These highly corrected optics offer vir tually coma- free pe[...]

  • Page 3

    3 to thread directly onto the optical tube. It may be useful to e xper iment with different combinations during the da y before heading out into the field. Choose a target over ½ mile aw ay to ensure you are sim ulating distant focus. If the f ocuser dra wtube is fully extended and you are still unable to achiev e f ocus you will need to install o[...]

  • Page 4

    4 T -ring 2” camera adapter 2” camera adapter StarShoot CCD Imager Focuser 2” extension Focuser 1” extension 2” extension 1” extension Focuser (w/ 1.25” adapter) Diagonal Eyepiece 2” extension 1” extension 1” extension Optical tube Optical tube Optical tube DSLR camera body DSLR Camera Configuration StarShoot Deep Space Imager C[...]

  • Page 5

    5 e xtension (1 x 1" and 1 x 2"). Larger 2" eyepieces may only require two inches of e xtension. Focusing the T elescope One of the e xciting new f eatures of the Or ion Ritchey- Chrétien optical tubes is the inclusion of the new linear bear- ing Cra yford f ocuser. Instead of the traditional Cra yford-style f ocuser — which uses [...]

  • Page 6

    6 2. Slide the chrome por tion of the ey epiece into the star diagonal. 3. Tighten the setscrew on the star diagonal to hold the ey epiece in place. T o remov e the ey epiece, loosen the setscrew on the star diagonal and slide the ey epiece out. Y ou c an replace it with another ey epiece (purchased separately). Image Orientation The image orientat[...]

  • Page 7

    7 Optical Axis Adjustment These adjustments will require a 3mm and 2.5mm he x k ey . There are three sets of “push-pull” screws on the bac k-end of the optical tube where the focuser attaches (Figure 8). The optical axis is denoted b y a thin outline of light around the perimeter of the view through the collimating ey epiece. Each set consists [...]

  • Page 8

    8 Ca r e a nd Cle ani ng of the Optics Do not disassemble the Ritche y-Chrétien f or any reason, including to clean the mirror . A small amount of dust and par- ticulates on the mirror’ s surf ace will not aff ect performance. In the ev ent inter nal cleaning is necessar y the telescope should be shipped to Orion T elescopes and Binoculars f or [...]

  • Page 9

    9 One-Y ear Limited W arranty The Orion Ritchey-Chrétien Astrographs are warranted against defects in materials or workmanship f or a period of one year from the date of purchase. This warr anty is f or the benefit of the or iginal retail pur - chaser only . During this warranty period Or ion T elescopes & Binoculars will repair or replace, at[...]