Description
The Kowa TSN-99S PROMINAR 99mm Straight Spotting Scope Body is engineered for serious birdwatchers and outdoor enthusiasts seeking high-performance optics. With its combination of extra low-dispersion and pure fluorite crystal glass, this scope minimizes chromatic aberrations, delivering exceptional color rendition, contrast, and clarity. The advanced optical lens coatings enhance light transmission, making it ideal for low-light conditions. Its compact design measures under 15 inches, ensuring portability without sacrificing optical power.
This spotting scope is built with a lightweight and durable magnesium alloy chassis, resistant to corrosion, and designed to withstand the elements. Nitrogen-filled and O-ring sealed, it prevents internal fogging and remains waterproof. The dual-focus system provides both quick and fine adjustments, allowing you to focus on fast-moving subjects or make precise adjustments with ease, even while wearing gloves. Accessory compatibility through a bayonet mount enhances usability for digiscoping and other applications.
Please Note: The eyepiece does not come with the scope; just the body is included.
Recommend Kowa 25-60x Wide Zoom Eyepiece or Kowa 25x Long Eye Relief Eyepiece
Features – Key Benefits Bullets
- EXCEPTIONAL CLARITY for detecting fine details with high contrast, thanks to fluorite glass.
- LIGHTWEIGHT DESIGN makes it easy to carry, perfect for long days in the field.
- DUST & WATER RESISTANT construction ensures reliability in adverse weather conditions.
- VERSATILE ACCESSORY COMPATIBILITY allows for enhanced functionality with optional eyepieces.
- DUAL-FOCUS SYSTEM enables rapid focusing and precise adjustments for tracking moving targets.
- COMPACT SIZE measuring under 15 inches for easy storage and transport.
- USER-FRIENDLY ERGONOMICS designed for comfortable prolonged use in the field.
- OPTICAL COATINGS maximize light transmission and reduce glare for superior viewing experiences.
Technical Specifications Table
| Specification | Details |
|---|---|
| Objective Lens Diameter | 99mm |
| Length | Under 15 inches |
| Weight | Lightweight magnesium alloy |
| Waterproof | Yes |
| Fog-proof | Nitrogen-filled and O-ring sealed |
| Compatibility | TE-80XW & TE-11WZ II eyepieces |
What’s in the Box?
- Kowa TSN-99S Prominar Spotting Scope Body
- Retractable sunshade
- User manual
Customer Reviews
"The clarity of this scope is unmatched. It's perfect for birdwatching!"
"Compact yet powerful. A must-have for serious outdoor enthusiasts."
FAQ
How does the Kowa TSN-99S perform in low light? The 99mm objective lens offers outstanding low-light performance, allowing for detailed observations during dawn or dusk.
Can I use filters with this spotting scope? Using a filter may restrict the use of the built-in lens hood, so it's recommended to utilize Kowa brand filters for optimal performance.
Similar Models
Explore additional offerings from Kowa for more specialized optics. For instance, consider the Kowa TSN-883 for a more compact option or the Kowa TSN-770 for enhanced mobility. Discover our full collection to find the perfect spotting scope tailored to your viewing needs.
Our Guarantees
FREE Fast Shipping Over $99
Enjoy complimentary expedited shipping on all orders over $99.
Secure Payments
Shop with confidence using our encrypted payment processing.
High Quality or Money Back
Not satisfied with your purchase? We'll refund your money, no questions asked.
Top-Notch Support
Our expert team is available to answer all your questions and provide assistance.
What Our Customers Say
Optics Knowledge Center
Understanding Rifle Scope Basics
Magnification
Magnification refers to how much larger an object appears through the scope compared to the naked eye. Fixed power scopes have one magnification setting, while variable power scopes offer a range (e.g., 3-9x).
Objective Lens
The objective lens is the front lens that gathers light. Larger objective lenses (measured in mm) gather more light, providing brighter images in low-light conditions but add weight and require higher mounting.
Reticle
The reticle (crosshair) is the aiming point inside the scope. Modern scopes offer various reticle designs, from simple duplex crosshairs to complex ballistic reticles with holdover points for different distances.
Adjustments
Rifle scopes have turrets for windage (horizontal) and elevation (vertical) adjustments. These are measured in MOA (minutes of angle) or MRAD (milliradians) and allow precise aiming adjustments.
Proper Scope Mounting Guide
Select the Right Rings & Base
Choose rings that match your scope's tube diameter (typically 1", 30mm, or 34mm). Select a base compatible with your rifle's receiver. For heavy-recoiling rifles, opt for stronger mounts.
Install the Base
Clean the receiver and base thoroughly. Apply a small amount of blue Loctite to the screws. Attach the base to the receiver and torque the screws to manufacturer specifications.
Attach the Rings
Attach the bottom halves of the rings to the base. Place the scope in the rings and loosely attach the top halves. Don't fully tighten yet.
Set Eye Relief & Level
Position the scope for proper eye relief (3-4 inches) in your normal shooting position. Ensure the reticle is level using a scope leveling tool. Once positioned correctly, tighten the rings evenly in a cross-pattern.
Scope Zeroing Tips
Start Close
Begin zeroing at a shorter distance (25-50 yards) to ensure you're on paper before moving to your desired zero distance (typically 100 yards).
Use a Stable Rest
Always zero your rifle from a stable shooting position using a bench rest, sandbags, or a shooting rest to eliminate as much human error as possible.
Fire Groups
Fire 3-shot groups before making adjustments. This provides a more accurate representation of where your rifle is shooting than single shots.
Make Deliberate Adjustments
Know your scope's adjustment values (typically 1/4 MOA per click). If your group is 2 inches low at 100 yards, you'll need to adjust up 8 clicks (for a 1/4 MOA scope).
Confirm Your Zero
After making adjustments, fire another group to confirm your zero. Repeat the process until your point of impact matches your point of aim.
Document Your Settings
Once zeroed, record your settings including distance, ammunition used, and environmental conditions for future reference.
Optics Maintenance & Care
Cleaning Lenses
- Start by blowing or brushing away loose particles
- Use a lens pen or microfiber cloth for fingerprints
- For stubborn dirt, use lens cleaning solution (never household cleaners)
- Clean with gentle circular motions from center outward
Protecting Your Optics
- Always use lens caps when not in use
- Store in a dry place with silica gel packets
- Avoid extreme temperature changes
- Use a quality scope cover in harsh conditions
Regular Maintenance
- Check and tighten mount screws periodically
- Inspect O-rings and seals for damage
- Verify zero after rough handling
- Clean the exterior with a damp cloth
What to Avoid
- Never use fingers to touch lenses
- Avoid paper products (tissues, paper towels) on lenses
- Don't use acetone, alcohol, or household cleaners
- Never disassemble your scope (voids warranty)