Celestron 90GT Manuals

INSTRUCTION MANUAL MODEL #22094 90GT | WiFi TELESCOPE 2 | ENGLISH 90GT | WiFi TELESCOPE Telescope optical tube assembly Large dust cap for objective lens Small dust cap for focuser Star Diagonal (1.25”) StarPointer finderscope and bracket (preassembled) Battery pack (batteries not included) Cosmic Calendar Poster 25 mm Kellner eyepiece (1.25”) 10 mm Kellner eyepiece (1.25”) Accessory tray SOLAR WARNING Never look directly at the Sun with the naked eye or with a telescope (unless you have the proper solar filter). Permanent and irreversible eye damage may result. 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 attached to it. Never use an eyepiece solar filter or a Herschel wedge. Internal heat build-up inside the telescope can cause these devices to crack or break, allowing unfiltered sunlight to pass through to the eye. Do not leave the telescope unsupervised, either when children are present or adults who may not be familiar with the correct operating procedures of your telescope. We recommend saving your telescope box so it can be used to store the telescope when it is not in use. Unpack the box carefully as some parts are small. Use the parts list below to verify that all parts and accessories are present. PARTS LIST WHAT’S IN THE BOX Fig. 1 Tripod (pre-assembled) ENGLISH | 3 90GT | WiFi TELESCOPE Fig. 2 Fig. 3 Fig. 4 PREREQUISITES Your Cosmos 90GT WiFi Telescope requires one of the following power sources: • 8 x AA batteries • 12 volt DC source with at least 1 ampere of current • Celestron PowerTank (Sold Separately) You will also need a smartphone or tablet to operate the telescope. Compatible devices include Apple iPhone or iPad with iOS 6 or later, and Samsung smartphones or tablets with Android 4.0. Visit celestron.com/cosmos for a complete compatibility list. Before you begin, you’ll need to install the free Cosmos™ Celestron Navigator app on your device. Download the app from the App Store or Google Play. ASSEMBLING YOUR TELESCOPE You won’t need tools to assemble the 90GT WiFi. Remove all the items from their packaging, then: 1. Open the tripod until the center brace is fully extended (Figure 2). 2. Thread the captive center bolt into the accessory tray (Figure 3). 3. Place the fork arm assembly on the tripod and secure it using the captive silver knob under the top of the tripod (Figure 4). 4. Attach the telescope optical tube by positioning the dovetail into the dovetail holder on the fork arm. Make sure the bottom of the dovetail is flat against the dovetail holder. Firmly tighten the thumb bolt. (Figure 5). 5. Adjust the tripod to a comfortable height and level it, using the lock knobs to secure each of the tripod legs. 6. Install eight AA batteries (not included) into the battery pack, noting the correct position for + and -. Leave the battery pack in the accessory tray. NOTE: The accessory tray has a special holder suitable for your smartphone or small tablet. Fig. 5 4 | ENGLISH 90GT | WiFi TELESCOPE ALIGNING THE STARPOINTER FINDERSCOPE The first time you assemble your telescope, you’ll need to align the StarPointer finderscope with the main optics of the telescope. This step can be done without powering on the telescope. Although this step can be done out in the field at night, it is significantly easier to accomplish this outdoors in daylight. Once you have completed the finderscope alignment, you should not have to repeat this step unless the finderscope is bumped or dropped. 1. Take the telescope outside during the day and, using your naked eye, find an easily recognizable object, such as a streetlight, car license plate, or tall tree. The object should be as far away as possible, but preferably at least a quarter mile away. 2. Remove the main dust cover from the front of the telescope by pulling it straight off. Make sure your star diagonal and 25 mm eyepiece are installed in the focuser. 3. Do not try to move the telescope left and right while it is off. Move the assembled tripod so the telescope is pointed in the direction of the object you chose in step 1. 4. Look through the telescope and move it up and down until the object you chose lies in the center of the view. If the image is blurry, gently turn the focus knobs on either side of the telescope until it comes into sharp focus. NOTE: The image you see in the eyepiece will appear mirror reversed. This is perfectly normal in an astronomical telescope. THE EYEPIECES AND STAR DIAGONAL The 90GT WiFi comes with two eyepieces (low power 25 mm and high power 10 mm) and a star diagonal. The eyepiece you choose determines your magnification and field of view. The star diagonal positions the eyepiece at a more comfortable 90º angle to the telescope and provides a right-side-up image. Note that because the telescope is designed for astronomical use, the image will be inverted. Whenever you set up your telescope, always start with the 25 mm eyepiece. After locating your target, you can switch to the higher power 10 mm eyepiece to get a more detailed view. Remove all dust caps, then insert the star diagonal into the focuser and tighten the 2 silver thumbscrews. Insert the 25 mm eyepiece and secure it by tightening the 2 thumbscrews on the star diagonal. THE STARPOINTER FINDERSCOPE Your telescope comes with a StarPointer red-dot finderscope that you will use as a sighting tool when aiming the telescope at a distant target. To install your StarPointer Finderscope: 1. Locate the silver thumbscrew at the back of the tube, near the focuser. Loosen it enough to allow the StarPointer bracket to slide into the dovetail slot (Figure 7). 2. Slide the base of the StarPointer into the dovetail base on the telescope near the focuser. Lock it in place by tightening the silver thumbscrew. Fig. 7 Fig. 6