1. Introduction
The SIGHTRONJAPAN NEWTONY DIY Astronomical Telescope Assembly Kit is designed to provide an engaging and educational experience in building and using a Newtonian reflector telescope. This kit allows users to understand the fundamental principles of telescope operation while assembling the device.
The assembly process is estimated to take approximately 30 minutes and requires only the tools provided within the kit. Upon completion, the telescope features a removable side cover, allowing for observation of its internal optical components.
With the included 10mm eyepiece, the telescope achieves a magnification of 20x, suitable for viewing celestial objects such as lunar craters and Jupiter's Galilean moons. Commercially available eyepieces can also be used, offering flexibility to adjust magnification for various observational targets. Additionally, a smartphone adapter is included, enabling users to easily capture images of celestial bodies.
The NEWTONY DIY telescope is ideal for casual astronomical observation from locations such as gardens, balconies, or campsites. It serves as an excellent project for summer holidays or independent study.
2. Package Contents
Verify that all components listed below are present in your kit. If any parts are missing or damaged, please contact customer support.

Image: All components of the NEWTONY DIY telescope kit, including the telescope body parts, eyepieces, smartphone adapter, and tabletop tripod, laid out on a flat surface.
- Telescope Body Components (main tube, covers, etc.)
- Main Mirror (Primary Mirror)
- Eyepieces (3 types):
- 10mm Eyepiece (standard)
- 10mm Eyepiece (transparent, for viewing internal structure)
- Screen Eyepiece
- Smartphone Adapter
- Tabletop Tripod
- Assembly Tools (e.g., small screwdriver, wrench)
- Instruction Manual (this document)
3. Assembly Instructions
Follow these steps carefully to assemble your NEWTONY DIY Astronomical Telescope. Refer to the diagrams for visual guidance.
3.1. Preparing the Main Tube
Begin by identifying the main tube components. Ensure the interior is clean and free of dust before proceeding.

Image: A user's hands are shown assembling the main tube of the telescope, with one half of the tube open to reveal the primary mirror and internal components. This demonstrates how the telescope's mechanism can be observed during assembly.
3.2. Installing Optical Components
- Carefully place the primary mirror into its designated housing within the main tube. Ensure it is seated securely.
- Attach the secondary mirror assembly according to the instructions, ensuring it is aligned to reflect light towards the eyepiece.
- Close the main tube covers, securing them with the provided screws. The side cover can be left slightly loose or opened later to view the internal mechanism.
3.3. Attaching the Focuser and Eyepiece
- Mount the focuser assembly to the main tube.
- Insert the desired eyepiece (e.g., the 10mm eyepiece) into the focuser.
3.4. Assembling the Tripod
- Extend the legs of the tabletop tripod.
- Attach the assembled telescope to the tripod mount. Ensure it is stable.

Image: The fully assembled NEWTONY DIY telescope is shown next to its original packaging, which contains the unassembled components. This illustrates the final product after successful assembly.
4. Operating the Telescope
4.1. Initial Setup for Observation
- Place the telescope on a stable, flat surface, such as a table or the ground, in an area with minimal light pollution.
- Ensure the tripod legs are fully extended and locked for stability.
- Select the appropriate eyepiece for your observation target. For general viewing, start with the 10mm eyepiece.
4.2. Focusing
To achieve a clear image, adjust the focuser knob until the object appears sharp. It may take some practice to find the precise focus point.
4.3. Observing Celestial Objects
The NEWTONY DIY telescope is suitable for observing bright celestial objects. Here are some examples:
- Moon: The 20x magnification allows for clear views of lunar craters and maria.
- Jupiter: You may be able to discern Jupiter's four largest moons (Galilean moons) as small points of light.
- Bright Stars: Individual bright stars can be observed.

Image: A clear, circular image of the Moon, demonstrating the kind of view achievable through the telescope.
4.4. Using the Smartphone Adapter
The included smartphone adapter allows you to attach your smartphone to the eyepiece for astrophotography.
- Attach the smartphone adapter to the eyepiece.
- Secure your smartphone to the adapter, aligning the phone's camera lens with the eyepiece.
- Open your phone's camera app and adjust the position until the telescope's view is centered on your screen.
- Adjust focus on the telescope and your phone's camera settings (e.g., exposure, ISO) for optimal image quality.

Image: The assembled NEWTONY DIY telescope is shown with a smartphone securely mounted to its eyepiece using the provided adapter, ready for astrophotography.
Note: Compatibility with smartphone models may vary. Ensure your phone is securely attached to prevent damage.
5. Maintenance and Care
Proper maintenance will ensure the longevity and performance of your telescope.
- Cleaning Optics: Use a soft, lint-free cloth specifically designed for optical lenses to clean eyepieces and mirrors. Avoid touching optical surfaces with bare hands. For stubborn dust, use a blower brush. Do not use abrasive cleaners.
- Storage: Store the telescope in a dry, dust-free environment. Keep it away from direct sunlight and extreme temperatures.
- Handling: Always handle the telescope carefully. Avoid dropping or subjecting it to impacts, which can misalign optical components.
- Internal Access: The side cover can be opened to view the internal mechanism. When doing so, be careful not to touch or dislodge any internal components. Close the cover securely after viewing.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Image is blurry or out of focus. | Focuser not adjusted correctly. | Slowly turn the focuser knob until the image becomes sharp. |
| Cannot see anything through the eyepiece. | Eyepiece cap still on; telescope pointed at an empty sky; object too faint. | Remove eyepiece cap. Point the telescope at a bright, easily visible object (e.g., the Moon). Ensure observation is done in a dark environment. |
| Image is dim or unclear. | Eyepiece or mirrors are dirty; light pollution. | Clean optical surfaces gently with appropriate cleaning tools. Move to a location with less artificial light. |
| Smartphone adapter does not fit or align. | Smartphone model incompatibility; incorrect positioning. | Ensure the adapter is correctly attached to the eyepiece. Adjust the phone's position on the adapter to align the camera lens. Note that some phone models may not be fully compatible. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | NEWTONY DIY |
| Model Number | NB100100019 |
| Optical System | Newtonian Reflector Telescope |
| Main Mirror Diameter | 50mm |
| Focal Length | 200mm |
| Eyepiece Focal Length (Included) | 10mm (resulting in 20x magnification) |
| Included Accessories | 3 types of eyepieces (10mm, 10mm transparent, screen eyepiece), Smartphone Adapter, Tabletop Tripod |
| Weight (excluding eyepiece accessories) | Approx. 500g |
| Product Dimensions (LxWxH) | 23 x 10.5 x 17 cm |
8. Warranty and Support
For warranty information and customer support, please refer to the official SIGHTRONJAPAN website or contact your retailer. Keep your purchase receipt as proof of purchase.
SIGHTRONJAPAN Contact Information:
- Official Website: https://www.sightron.co.jp/ (Please check for English language support or use translation tools)
- For inquiries, please use the contact form or email address provided on their official website.

Image: Logo of the Japan Telescope Manufacturers Association (JTMA), indicating adherence to industry standards.