1. Introduction
The Nikon PROSTAFF 3S 10x42 Binoculars are designed for outdoor enthusiasts, offering clear and bright images. This model features an optical system crafted from lead-and-arsenic-free Eco-Glass, ensuring environmental responsibility without compromising performance. Multilayer coatings are applied to all lenses and prism surfaces, providing high light transmittance across the entire visible light spectrum for vivid views.
Key Features:
- Multilayer-coated lenses for brighter images
- High-reflectivity silver-alloy mirror coatings for a bright and clear view
- Turn-and-slide rubber multi-click eyecups for comfortable viewing
- Waterproof and Fogproof construction for reliable performance in various weather conditions
2. Included Components
Your Nikon PROSTAFF 3S 10x42 Binoculars package includes the following items:
- Nikon PROSTAFF 3S 10x42 Binoculars
- Binocular Case
- Neck Strap
- Objective Lens Caps
- Eyepiece Caps
- Cleaning Cloth

Figure 2.1: Nikon PROSTAFF 3S 10x42 Binoculars with strap and lens caps.
3. Setup and Adjustments
3.1 Adjusting Eyecups
The binoculars feature turn-and-slide rubber multi-click eyecups. To adjust for comfortable viewing, especially if you wear eyeglasses, rotate the eyecups up or down. If you wear eyeglasses, rotate the eyecups down to their lowest position. If you do not wear eyeglasses, rotate them up until you achieve a full field of view without vignetting (darkening around the edges).

Figure 3.1: Adjustable eyecups on the Nikon PROSTAFF 3S 10x42 Binoculars.
3.2 Adjusting Interpupillary Distance
Hold the binoculars with both hands and look through them. Adjust the distance between the two barrels until you see a single, circular field of view. This ensures that the binoculars are correctly aligned with the distance between your eyes.
3.3 Focusing
The PROSTAFF 3S 10x42 binoculars feature a central focus knob for quick and precise focusing. To focus, first close your right eye and rotate the central focus knob until the image in your left eyepiece is sharp. Then, open your right eye and close your left eye, and rotate the diopter ring (located on the right eyepiece) until the image in your right eyepiece is sharp. Once both are set, use only the central focus knob for general focusing.
4. Operating Your Binoculars
Once properly adjusted, your Nikon PROSTAFF 3S 10x42 Binoculars are ready for use. Simply bring them to your eyes and observe your desired subject. The 10x magnification provides a powerful view, while the 42mm objective lens diameter ensures bright images, even in challenging light conditions.

Figure 4.1: Nikon PROSTAFF 3S 10x42 Binoculars ready for observation.
5. Care and Maintenance
5.1 Cleaning Lenses
To clean the lenses, first brush off any dust or debris with a soft lens brush or a can of compressed air. Then, use the provided cleaning cloth or a clean, soft cotton cloth, lightly moistened with lens cleaning fluid, to gently wipe the lens surfaces in a circular motion. Avoid using abrasive materials or excessive force, as this can scratch the coatings.
5.2 Cleaning Body
Wipe the body of the binoculars with a soft, clean cloth. For stubborn dirt, a slightly damp cloth can be used. Ensure the binoculars are completely dry before storing.
5.3 Storage
When not in use, store the binoculars in their protective case in a cool, dry place. Avoid exposing them to extreme temperatures or high humidity for extended periods. Always attach the objective lens and eyepiece caps to protect the lenses from dust and scratches.
5.4 Waterproof and Fogproof
These binoculars are designed to be waterproof and fogproof. While they can withstand exposure to moisture, avoid submerging them in water for prolonged periods. If they become wet, wipe them dry with a clean cloth.
6. Troubleshooting
6.1 Blurred Image
- Ensure the central focus knob and diopter ring are correctly adjusted for your eyes.
- Check if the lenses are clean and free from smudges or debris.
- Verify that the interpupillary distance is set correctly for a single, circular field of view.
6.2 Double Image
- Adjust the interpupillary distance by moving the barrels closer or further apart until the two images merge into one.
6.3 Fogging Inside Lenses
- While the binoculars are fogproof, extreme and rapid temperature changes can sometimes cause temporary internal fogging. Allow the binoculars to acclimate to the ambient temperature. If persistent, contact customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | Nikon |
| Model Number | 6977 |
| Magnification Maximum | 10x |
| Objective Lens Diameter | 42 Millimeters |
| Special Feature | Fog Proof, Waterproof |
| Mounting Type | Roof |
| Material | Plastic |
| Color | Black |
| Item Weight | 4.8 ounces |
| Product Dimensions | 3.23 x 6.14 x 7.09 inches |
| Age Range (Description) | Adult |
| Date First Available | January 28, 2016 |
8. Warranty and Support
8.1 Warranty Information
The Nikon PROSTAFF 3S 10x42 Binoculars come with a Lifetime Limited Warranty. Please refer to the official Nikon warranty documentation included with your product for full details regarding coverage, terms, and conditions.
8.2 Customer Support
For technical assistance, service, or warranty claims, please contact Nikon customer support through their official website or the contact information provided in your product packaging. Keep your proof of purchase handy when contacting support.





