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Orion 9527 manual

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Table of contents for the manual

  • Page 1

    INSTRUCTION MANUAL IN 378 Rev . A 1/10 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 ® 8" f/4.0 Newtonian Astr ograph #9527 Providing Exceptional Consumer Optical Products Since 1975 Orio nT e lesc opes.com[...]

  • Page 2

    2 Congratulations on your purchase of an Or ion ® 8" f/4.0 Newtonian Astrograph. It f eatures f ast, high- quality parabolic optics; a machined, dual-speed Cra yf ord f ocuser with linear-tr ack bearing; and e xcellent mechanical construction. This telescope has been specially optimized f or astrophotograph y with DSLR and astronomical CCD im[...]

  • Page 3

    3 are M6. It is lik ely that only the center hole will be needed to attach the r ings to a dov etail plate f or your mount or for your guide scope assembly . Balancing the 8" f/4.0 Ne wtonian Astrogr aph is achie ved by sliding the dov etail mounting plate (sold separately) f or - ward or backw ard within the mount’ s dov etail saddle. Y ou [...]

  • Page 4

    4 Using 1.25" and 2" Accessories The 2" f ocuser can accommodate both 1.25" and 2" accesso- ries, including just about any e yepiece or camera. Both the 2" collar and remov able 1.25" adapter feature a brass compres- sion r ing to hold your accessories in place without marring their metal barrels. The bottom of th[...]

  • Page 5

    5 is centered on the crosshairs of the finder scope and in the telescope’ s e yepiece, the finder scope is aligned and ready to be used f or locating objects. The finder scope alignment should be chec ked bef ore ev er y imaging or observing session. This can easily be done at night, bef ore viewing through the telescope. Choose any bright star o[...]

  • Page 6

    6 Imaging with the 8" f/4.0 Newtonian Astrograph This instr ument has f ast f/4.0 parabolic optics, which pro - duce br ight images and allow fairly shor t e xposure times. F ast optics also inherently produce some coma, or distor - tion of star images toward the peripher y of the field of view . Theref ore, to achiev e the best possible image[...]

  • Page 7

    7 is a relatively easy process and can be done in da ylight or darkness. T o check collimation, remo ve the e yepiece and look do wn the f ocuser drawtube . Y ou should see the secondar y mirror cen - tered in the dra wtube, as well as the reflection of the primar y mirror centered in the secondar y mirror , and the reflection of the secondary mirr[...]

  • Page 8

    8 NO TE: The center ring sticker need not ever be remo ved from the primary mirror . Because it lies directly in the shadow of the secondary mirror , its presence in no way adver sely affects the optical performance of the tele - scope or the image quality . That might seem counter- intuitive, but it’ s true! Preparing the T elescope for Collimat[...]

  • Page 9

    9 By “ra dia l p osi tio n” w e me an the po sit ion of the se con dar y mirror along the axis per pendicular to the f ocuser drawtube, as shown in Figure 13 . This position is changed by adjusting two of the spider vane thumb nuts, as shown. Loosen one thumb nut, then tighten the opposite one until the second - ar y mirror is centered radially[...]

  • Page 10

    10 The view through the collimation cap should now resemble Figure 9e . A simple star test will indicate how well the tele - scope optics are collimated. Star-T esting the T elescope When it is dar k, point the telescope at a bright star and accu- rately center it in the eyepiece’ s field of view . (T o achiev e f ocus with an eyepiece , y ou wil[...]

  • Page 11

    11 the Phillips-head screw is unthreaded, the secondar y mirror and its holder can be remov ed from the telescope. The sec - ondar y mirror does not need to be remov ed from its holder for cleaning. Then follow the same procedure described below f or cleaning the pr imar y mirror . T o clean the pr imar y mirror , first carefully remov e the mirror[...]

  • Page 12

    12 One-Y ear Limited W arranty The Orion 8" f/4.0 Newtonian Astrogr aph is warranted against def ects in mater ials 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 per iod Or ion T elescopes & Binoculars will repair or re[...]