Celestron Advanced VX 11 Schmidt-Cassegrain Telescope Advanced VX Manual - Page 27

1. L oosen the set screw on the eyepiece holder so that it does not obstruct the inner diameter of the eyepiece holder. 2. S lide the chrome portion of the eyepiece into the eyepiece holder. 3. T ighten the set screw to hold the eyepiece in place. Chrome Portion Eyepiece Holder Eyepiece Eyepiece Star Diagonal Visual Back If you wish to change the orientation of the star diagonal, loosen the set screw on the visual back until the star diagonal rotates freely. Rotate the diagonal to the desired position and tighten the set screw. To remove the eyepiece, loosen the setscrew on the eyepiece holder and slide the eyepiece out. You can replace it with another ocular. Eyepieces are commonly referred to by focal length which is printed on the eyepiece barrel. The longer the focal length (i.e., the larger the number), the lower the eyepiece magnification. The shorter the focal length (i.e., the smaller the number), the higher the eyepiece magnification. Generally, you will use low-to moderate power when viewing. If you have the 8" Newtonian optical tube (#32062), your telescope can use eyepieces with both a 1.25" and 2" barrel diameters. To use a 2" barrel eyepiece, the 1.25" eyepiece adapter must first be removed and replaced with the included 2" eyepiece adapter. To do this, simply loosen the two chrome thumbscrews located around the focuser barrel and remove the 1.25" adapter. Once removed, a 2" eyepiece adapter can be inserted directly into the focuser barrel and secured with the two thumb screws. Setting up the EdgeHD and SchmidtCassegrain Optical Tubes (#12031, #12079, #12026, #12046 and #12067) Installing the Star Diagonal The star diagonal is a prism that 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 than if you looked straight through. To attach the star diagonal onto the optical tube: 1. Turn the set screw on the visual back until its tip no longer extends into (i.e., obstructs) the inner diameter of the visual back. 2. Slide the chrome portion of the star diagonal into the visual back. 3. Tighten the set screw on the visual back to hold the star diagonal in place. Installing the Eyepiece The eyepiece, or ocular, is an optical element that magnifies the image focused by the telescope. The eyepiece fits into either the visual back directly or the star diagonal. To install an eyepiece: 1. Loosen the set screw on the star diagonal until the tip no longer extends into the inner diameter of the eyepiece end of the diagonal. 2. Slide the chrome portion of the eyepiece into the star diagonal. 3. Tighten the set screw on the star diagonal to hold the eyepiece in place. To remove the eyepiece, loosen the set screw on the star diagonal and slide the eyepiece out. You can replace it with another eyepiece (purchased separately). Eyepieces are commonly referred to by focal length and barrel diameter. The focal length of each eyepiece is printed on the eyepiece barrel. The longer the focal length (i.e., the larger the number), the lower the eyepiece magnification. The shorter the focal length (i.e., the smaller the number), the higher the magnification. Generally, you will use lowto-moderate power when viewing. For more information on how to determine power, see the section on "Calculating Magnification." Installing the 6x30 Finderscope The 6", 8" and 9-1/4" Schmidt Cassegrain telescopes come with 6x30 finderscopes used to help you locate and center objects in the main field of your telescope. To accomplish this, the finder has a built-in cross-hair reticle that shows the optical center of the finderscope. To install the finderscope: 1. Attach the bracket to the optical tube. To do this, place the curved portion of the bracket with the slot over the two holes in the rear cell. The bracket should be oriented so that the rings that hold the finder are over the telescope tube, not the rear cell. Start threading the screws in by hand and tighten fully with an screw driver I 27