1. Introduction and Overview
This manual provides comprehensive instructions for the assembly, operation, and maintenance of your Bresser NANO AR-70/700 AZ Telescope. Please read this manual thoroughly before using the telescope to ensure safe and optimal performance.
Even if the 70mm aperture on paper doesn't sound like much, the BRESSER Messier AR-70/700 AZ offers 36% more light than a comparable 60mm refractor. This is evident in its optical performance: on the planet Jupiter, the two main cloud bands are visible at a distance of 600 million km. Delivered almost entirely pre-assembled, it can be observed immediately without extensive setup. Additionally, the included smartphone holder allows you to easily capture magnified and colorful photos of celestial objects with your mobile phone, similar to using a telephoto lens.
2. Package Contents
Verify that all components listed below are present in your package:
- Refractor Telescope Tube
- Azimuthal Mount
- Aluminum Tripod with Accessory Tray
- Eyepieces: 9 mm, 20 mm
- Zenith Mirror 1.25" (31.7 mm)
- LED Red Dot Finder
- Smartphone Camera Adapter
- Software (if applicable, check packaging for details)
- Rotating Star Chart

Image: All included accessories, including eyepieces, zenith mirror, LED red dot finder, smartphone adapter, and a solar filter.
3. Setup
The Bresser NANO AR-70/700 AZ Telescope is largely pre-assembled for quick setup. Follow these steps to prepare your telescope for observation:
- Set up the Tripod:
Extend the legs of the aluminum tripod to a stable height. Ensure the tripod is placed on a level surface. Secure the accessory tray to the center brace of the tripod.

Image: The Bresser NANO AR-70/700 AZ Telescope mounted on its aluminum tripod.
- Attach the Azimuthal Mount:
The azimuthal mount should already be attached to the tripod. This mount allows for easy horizontal and vertical movement of the telescope.
- Mount the Telescope Tube:
Carefully attach the refractor telescope tube to the azimuthal mount. Ensure it is securely fastened. The telescope is designed for easy mounting, making it suitable for beginners.

Image: Side view of the telescope tube attached to the azimuthal mount.
- Install the Zenith Mirror:
Insert the 1.25" (31.7 mm) zenith mirror into the focuser of the telescope. This accessory provides a more comfortable viewing angle.

Image: The 1.25-inch zenith mirror, used for comfortable viewing.
- Insert an Eyepiece:
Choose either the 9 mm or 20 mm eyepiece and insert it into the zenith mirror. The 20 mm eyepiece provides lower magnification and a wider field of view, ideal for locating objects. The 9 mm eyepiece offers higher magnification for detailed observation.

Image: The 9mm and 20mm eyepieces, along with the LED red dot finder.
- Attach the LED Red Dot Finder:
Mount the LED red dot finder onto the telescope tube. This finder helps in quickly pointing the telescope to desired celestial objects.
4. Operating Instructions
4.1. Basic Observation
- Align the Red Dot Finder:
Before observing, align the red dot finder with the main telescope. Point the telescope at a distant, stationary object (e.g., a tree or building) during daylight. Look through the main telescope's eyepiece and center the object. Then, adjust the red dot finder until its red dot is also centered on the same object.
- Locating Objects:
Use the red dot finder to point the telescope towards your desired celestial object. Once the object appears in the finder's view, look through the telescope's eyepiece. Start with the 20 mm eyepiece for a wider field of view to easily locate the object.
- Focusing:
Adjust the focuser knob until the image appears sharp and clear. For fine-tuning, you may switch to the 9 mm eyepiece for higher magnification once the object is centered and in focus with the 20 mm eyepiece.
- Tracking Objects:
Due to Earth's rotation, celestial objects will appear to drift out of view. Use the azimuthal mount's slow-motion controls (if available, or gently nudge the telescope) to track the object and keep it centered in your field of view.
4.2. Smartphone Photography
The included smartphone adapter allows you to capture images of celestial objects directly through your telescope.
- Attach Smartphone Adapter:
Secure your smartphone to the adapter. Then, attach the adapter with the phone to the eyepiece of the telescope.

Image: A smartphone mounted on the adapter, displaying a magnified view of the moon.
- Adjust Camera Position:
Align your smartphone's camera lens with the eyepiece. You may need to adjust the adapter's position to ensure the telescope's view fills your phone's screen without vignetting.
- Capture Images:
Use your phone's camera app to take photos or record videos. Experiment with different exposure settings and focus adjustments on your phone for best results.
5. Maintenance
Proper care and maintenance will extend the life of your telescope and ensure optimal performance.
- Cleaning Optics:
Use a soft, lint-free cloth specifically designed for optical lenses to clean the telescope's objective lens and eyepieces. Gently brush away any dust particles first. For stubborn smudges, use a small amount of optical cleaning fluid applied to the cloth, not directly to the lens.
- Storage:
When not in use, store the telescope in a dry, dust-free environment. Keep lens caps on to protect the optics from dust and scratches. Avoid storing in areas with extreme temperature fluctuations or high humidity.
- General Care:
Avoid touching optical surfaces with bare hands. Do not overtighten screws or knobs. Regularly check all connections to ensure they are secure.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Image is blurry or out of focus. | Incorrect focus setting. | Adjust the focuser knob until the image is sharp. |
| Cannot see anything through the eyepiece. | Lens caps are still on; telescope not pointed correctly; wrong eyepiece. | Remove all lens caps. Ensure the red dot finder is aligned and the telescope is pointed at an object. Start with the 20mm eyepiece. |
| Objects drift out of view too quickly. | Earth's rotation. | Continuously make small adjustments to the telescope's position using the azimuthal mount to track the object. |
| Red dot finder not aligned. | Misalignment during setup. | Re-align the red dot finder with the main telescope during daylight hours using a distant, stationary object. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | BRESSER |
| Model Number | 4570700 |
| Optical Design | Refractor (Achromatic) |
| Aperture | 70 mm |
| Focal Length | 700 mm |
| Focal Ratio | f/10 |
| Maximum Magnification | 140x |
| Mount Type | Azimuthal Mount |
| Tripod | Aluminum Tripod |
| Eyepieces Included | 9 mm, 20 mm |
| Zenith Mirror | 1.25" (31.7 mm) |
| Finder Scope | LED Red Dot Finder |
| Compatible Devices | Smartphone (with included adapter) |
| Product Dimensions (L x W x H) | 30 x 18 x 89 cm (telescope tube) |
| Overall Dimensions (assembled) | 90 x 90 x 155 cm |
| Item Weight | 3 kg |
| Country of Origin | China |
8. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or visit the official BRESSER website. Keep your proof of purchase for any warranty claims.
For further assistance, you may contact BRESSER customer service through their official channels. Always provide your model number (4570700) when seeking support.







