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Summary of Contents for Apertura Dobsonian Telescope
- Page 2 Apertura™ Dobsonian Telescope. Before using your Apertura™ Dobsonian Telescope, please review and follow the “Procedure for collimation” section of this manual. You must properly collimate your telescope to achieve optimal viewing through this quality optical instrument.
- Page 3 DOBSONIAN TELESCOPE Assembly Instructions and User’s Guide...
- Page 4 Unpacking your Apertura™ Dobsonian Telescope Parts list: Optical Tube Box (package 1 of 2) Dobsonian optical tube Eyepieces: 8x50 90-degree right-angle finderscope 30 mm (2” format) Plastic tube cover 9 mm (1.25” format) Laser collimator 2”-to-1.25” eyepiece adapter 2 silver side bearings...
- Page 5 Base Mount Box (package 2 of 2) Wood components: 1 adjustment knob assembly: 1 small panel – front 1 bolt with knob head 1 large panel – right 1 large washer 1 large panel – left 1 small bearing washer 2 large round base plates 1 small washer Turntable hardware:...
- Page 6 Assembling the DOBSONIAN BASE HOUSING Attach handle to the BASE FRONT with two medium silver Allen screws. The curved edge of the board is the top of this part when vertical. ! IMPORTANT ! Make sure the flat face of the embedded T-nuts are on the BACK BACK side of the board (opposite the handle).
- Page 7 Locate the BOTTOM BASE PLATE. The BOTTOM BASE PLATE has 3 holes around its edge and a brass fitting in the center hole. Attach the 3 feet to the BOTTOM BASE PLATE’s bottom side with 3 medium Phillips screws, with the wider side of the feet facing the board.
- Page 8 Screw long black Allen screws through the BOTTOM BASE into the BASE HOUSING making sure the side with the recessed holes is facing away from the BASE HOUSING. Place BOTTOM BASE PLATE with feet facing down. Insert AXLE SLEEVE into the Center hole.
- Page 9 Now place the ROUND PLASTIC ROLLER-BEARING DISC over the first METAL DISC. (It can be flipped either way) Follow this with placing the second METAL DISC over the ROLLER-BEARING DISC. (It can be flipped either way) Pick up the BASE HOUSING with UPPER BASE PLATE already attached and place it onto the AXLE SLEEVE of the...
- Page 10 TIP: Tightening or loosening this knob is how you will adjust the amount of effort it takes to rotate your Apertura™ Dobsonian telescope on its base. Attach the 4-HOLE EYEPIECE TRAY to the BASE RIGHT panel of the...
- Page 11 Assembling the OPTICAL TUBE Remove (2) bolts located on each side of the OPTICAL TUBE Align SILVER SIDE BEARING ASSEMBLY with the same holes and insert the top bolt first (do NOT tighten yet). Then slide the BEARING ASSEMBLY up if necessary and insert the bottom bolt.
- Page 12 With the included accessories attached to the Apertura Dobsonian Telescope, balance is achieved with these initial settings (see pictures). NOTE: When other accessories are attached to the OTA, the balance point may change and appropriate adjustments to this these settings may be required.
- Page 13 Locate the 90-DEGREE RIGHT- ANGLE FINDERSCOPE and attach it to the dovetail finderscope bracket on the side of the OPTICAL TUBE. Use the thumbscrew to tighten the finderscope into place.
- Page 14 Aligning Your Finderscope When first attached, the finderscope will not be perfectly aligned with the telescope’s optics. Once the finderscope is properly aligned with the main telescope’s view, the finderscope’s extra-wide field of view will help you easily center the main telescope on objects you wish to view. ...
- Page 15 10:1 Precision Micro Crayford Style Focuser Your Apertura Dobsonian Telescope comes standard with a Dual-Speed 10:1 focuser. It is pictured here with the drawtube fully extended. Brass Compression Ring Focuser Drawtube extended Compression Adjustment Screws Tensioning Screw Full speed adjustment wheel...
- Page 16 Eyepiece Selection Your Apertura™ Dobsonian Telescope comes standard with two eyepieces: a 2” diameter wide field, low-power eyepiece with a 30mm focal length and a 1.25” diameter high-power eyepiece with a 9mm focal length. To get the best results from your telescope, always start with your widest field (lowest power) eyepiece, then work your way up to the higher power eyepiece, keeping the image centered throughout.
- Page 17 Since the Earth is always rotating, astronomical objects will appear to move across the night sky. When using your Apertura™ Dobsonian Telescope for a little while, you need to manually track the observed objects by carefully moving the scope’s tube to keep the...
- Page 18 object relatively centered in the eyepiece. Using higher magnification means that you have to make more frequent tracking adjustments than when using lower magnification. A popular method for locating night sky objects is called “star-hopping.” Start by finding a known star or moon or planet, and scan from there to other stars closer to the destination object.
- Page 19 the shape of the secondary mirror is actually oval, when properly aligned it will appear to be circular as viewed through the focuser. Insert the laser collimator into the 2” adapter sleeve and then insert that into the focuser. Secure the laser collimator with the thumbscrew. Turn on the laser collimator and rotate its target face toward the back end of the scope (the primary mirror end).
- Page 20 This is normal and is best left alone. If it is absolutely necessary, use only an optical lens brush and lens bulb puffer to remove dust from your mirrors. The outside of your Apertura™ Dobsonian Telescope is easily cleaned with a dust cloth or sponge for fingerprints, dust, etc.
- Page 21 I N D E X TOPIC Page SECTIONS Acclimation Optical Tube Box – Parts list Page 2 Alignment, Finderscope Balance Base Mount Box – Parts List Page 3 Base, Assembly Base, Parts List Assembly – Base Page 4 Bearing, side Cleaning Assembly –...
- Page 22 2015 Rev. 3/15...
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Questions and answers
How do I insert the lens into the focuser
How do I set the balance point for my apertura eight telescope with the stock items/attachments I received with the telescope. In other words, what settings do I tighten the screws on the side Optical tube supports for the standard balance point?
To set the balance point for the Apertura Dobsonian Telescope using the stock items and attachments:
1. Align the Silver Side Bearing Assembly with the same holes on both sides of the Optical Tube.
2. Insert the top bolt first but do not tighten it yet.
3. Slide the Bearing Assembly up if needed and insert the bottom bolt.
4. Repeat the process for the other side of the Optical Tube.
5. The position of the Bearing Assemblies determines the balance point and may need adjustment depending on installed accessories.
6. With the included accessories, the balance should be achieved using the initial settings provided.
7. If additional accessories are attached, adjust the Bearing Assembly positions accordingly.
8. When placing the Optical Tube onto the Base Housing, ensure:
- The metal seam of the telescope tube is turned toward the handle side (Base Front).
- The flat sides of the Silver Side Bearing Assemblies face upward.
9. Use the black plastic knobs on the side to fine-tune balance if necessary.
By following these steps, you can achieve proper balance for smooth operation.
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