Celestron StarSense Explorer 150mm Smartphone App-Enabled Tabletop Dobsonian Tel - Page 8
Focusing
View all Celestron StarSense Explorer 150mm Smartphone App-Enabled Tabletop Dobsonian Telescope manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 8 highlights
FOCUSING The SSE Dobs come with a 2" Crayford focuser, a 2" extension tube, and a 2"-to-1.25" eyepiece adapter. With these three items, you can use virtually any telescope eyepiece with the SSE Dob. For most eyepieces, make sure the 2" extension tube is in place in the focuser. If it's not, the eyepiece will not reach focus. If you're using an eyepiece that requires a lot of inward focus travel, remove the 2" extension tube. You may need to remove the tube if attempting to use your Dob with an astronomical imaging camera. If you wish to use a 1.25" format eyepiece, you'll need to use the 2"-to-1.25" eyepiece adapter. Simply place it in the focuser (with 2" extension tube attached), and then place the 1.25" eyepiece in the adapter. Tighten the thumbscrew on the adapter to secure the eyepiece in place. The adapter uses an internal brass compression ring so your eyepiece barrel won't be scratched or marred. To focus, turn the focus knobs clockwise or counterclockwise until the object in the telescope eyepiece is in sharp focus. To lock the focuser position in place once you have achieved sharp focus, tighten the focus lock thumbscrew (Figure 5). If you need to adjust the focus knob's tension, you can tighten or loosen the focuser tensioning set screw using the provided hex key. Since the SSE Dob is a Newtonian reflector, the images you'll see will appear upside-down as compared to the naked eye (Figure 6). While this has little impact on astronomical observing, it can be a bit confusing when you are viewing land-based objects. NAKED EYE VIEW FOCUS LOCK THUMBSCREW VIEW THROUGH NEWTONIAN REFLECTOR TELESCOPE Figure 6: Like all Newtonian reflectors, the SSE Dobs produce images that appear upside-down as compared to the naked eye. FOCUSER TENSIONING SET SCREW Figure 5: The focus lock thumbscrew locks the focuser in place once focus has been achieved. The focus tensioning set screw adjusts the tension of the focusing knobs. 8 I ENGLISH