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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.
Start by inserting the large 30mm eyepiece into the telescope's focuser. Point the telescope at a large,
distant and stationary object (such as the detail on a billboard at least 250 yards away). Focus the eyepiece and
center that distant object in the eyepiece; in other words, start with an earthbound object for focusing and
alignment. If you are not able to achieve good focus, you may need to insert the included 35mm Extension Tube
into the focuser and then insert the 30mm eyepiece into the extension tube. The 35mm Extension Tube is used
with low-power eyepieces to extend the focal length, making it possible to focus at low magnification.
Now look through the finderscope. To focus the finderscope, first loosen the lens cell by unscrewing it a
half-turn. Then turn the locking ring the other way, to pull it back from the lens cell and expose the maximum
number of threads on the finderscope body. Turn the lens back and forth to focus your view. Once the lens is
focused, then tighten the locking ring to hold the lens cell in place. You may need to make a slight focus
adjustment the first time you use the finderscope on the night sky, but once the focus is set on the sky you
should not need to adjust it again.
Finderscope Locking Ring
Finderscope Lens Cell
Once focused, then align your finderscope by gently
adjusting the two thumbscrews on the finderscope bracket (the silver "knob" contains a spring that gives back-
pressure to the thumbscrews and does not need adjustment). Carefully align the finderscope body until its
crosshairs are centered on the object that is currently centered in the main telescope's eyepiece.
If you bump the finderscope during transport or use and disturb its alignment, it will only require a quick and
easy adjustment of the two thumbscrews to realign the finderscope to the main telescope's view.
Alignment Screws
(black Nylon)
Spring Tensioner
(no adjustment)
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Do you have a question about the Dobsonian Telescope and is the answer not in the manual?
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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