1. Introduction
Thank you for choosing the FULLJA 12x42 HD Binoculars. These binoculars are designed to provide a superior viewing experience with 12x magnification and 42mm objective lenses, featuring BAK4 prisms and FMC lens coating for enhanced image clarity. This manual provides essential information for setting up, operating, and maintaining your binoculars to ensure long-lasting performance and enjoyment.
2. Package Contents
Please verify that all items listed below are included in your package:
- FULLJA 12x42 HD Binoculars
- Carrying Case
- Neck Strap
- Ocular Lens Caps
- Objective Lens Covers
- Cleaning Cloth
- Phone Adapter
- Mini Tripod
- Instruction Manual

Figure 1: All items included in the FULLJA 12x42 HD Binoculars package.
3. Product Overview
Familiarize yourself with the different parts of your binoculars:

- Eyepiece Cover: Protects the ocular lenses when not in use.
- Right Eyepiece Focus Ring: Used for diopter adjustment to compensate for differences in vision between your eyes.
- Central Focus Wheel: Adjusts the focus for both barrels simultaneously.
- Ocular Lens: The lenses you look through.
- Slip-Proof Material: Provides a secure and comfortable grip.
- Objective Lens Cover: Protects the objective lenses when not in use.
- Tripod Interface: Allows attachment to a tripod for stable viewing.
4. Setup
Follow these steps to prepare your binoculars for use:
- Attach Neck Strap: Thread the neck strap through the strap loops on the binoculars. Ensure it is securely fastened.
- Adjust Interpupillary Distance: Hold the binoculars with both hands and look through them. Adjust the distance between the two barrels until you see a single, clear circular field of view.
- Adjust Eyecups: If you do not wear glasses, twist the eyecups up. If you wear glasses, twist them down to ensure a full field of view.
- Initial Focusing:
- Close your right eye and focus on a distant object using the central focus wheel until the image in your left eye is sharp.
- Open your right eye and close your left eye. Adjust the right eyepiece focus ring until the image in your right eye is sharp.
- Now, both eyepieces are adjusted to your eyes. For subsequent use, only the central focus wheel is needed to focus on different objects.
- Attaching Phone Adapter and Tripod:
- Screw the mini tripod into the tripod interface on the binoculars.
- Attach the phone adapter to one of the ocular lenses.
- Secure your smartphone into the phone adapter, aligning your phone's camera lens with the binocular's ocular lens. This allows for capturing photos or videos through the binoculars.
Video 1: Demonstrates the features and setup of the FULLJA 12x42 Binoculars, including adjusting the focus and attaching accessories.
5. Operating Instructions
Your FULLJA 12x42 HD Binoculars are designed for ease of use and provide powerful magnification for various activities.
- Viewing: Once adjusted and focused, simply point the binoculars at your desired object and use the central focus wheel for fine-tuning.
- Magnification: Enjoy 12x magnification, bringing distant objects 12 times closer.
- Field of View: The binoculars offer a wide field of view (114m to 1000m), ideal for tracking moving subjects or observing expansive landscapes.
- Low-Light Vision: The binoculars provide clear vision in low-light conditions, but they are not suitable for use in complete darkness.

Figure 2: The binoculars are suitable for various outdoor activities, including sports events.
6. Maintenance
Proper care will extend the life and performance of your binoculars:
- Cleaning Lenses: Use the provided microfiber cleaning cloth to gently wipe the lenses. For stubborn smudges, breathe lightly on the lens surface before wiping. Avoid using abrasive cloths or harsh chemicals.
- Cleaning Body: Wipe the rubber armor with a soft, damp cloth.
- Storage: Store the binoculars in their carrying case in a cool, dry place when not in use. Avoid extreme temperatures and high humidity.
- Waterproof Feature: These binoculars are waterproof, offering protection against moisture. However, avoid prolonged submersion in water.
7. Troubleshooting
If you encounter any issues, refer to the following common solutions:
- Blurry Image: Ensure the central focus wheel and the right eyepiece focus ring are correctly adjusted for your vision and the distance to the object. Check that the eyecups are set appropriately for glasses wearers or non-wearers.
- Double Image: Re-adjust the interpupillary distance until a single, clear circular field of view is achieved.
- Dark or Obstructed View: Check that the lens caps have been removed from both the ocular and objective lenses. Ensure lenses are clean and free from smudges or debris.
8. Specifications
| Feature | Specification |
|---|---|
| Product Dimensions | 7.16 x 2.56 x 7.36 inches |
| Item Weight | 1.1 pounds |
| Magnification Maximum | 12.00x |
| Objective Lens Diameter | 42 Millimeters |
| Special Feature | Compact, Waterproof |
| Prism Type | BAK4 |
| Lens Coating | FMC (Fully Multi-Coated) |
| Field of View | 114m to 1000m |
9. Warranty and Support
Your FULLJA 12x42 HD Binoculars come with a one-year limited warranty. For any questions, technical support, or warranty claims, please contact FULLJA customer service through the retailer where the product was purchased.





