Kowa TP-105FT 105mm Multi-Coated Filter Review

First Impressions of Kowa TP-105FT 105mm Multi-Coated Filter

The Kowa TP-105FT 105mm Multi-Coated Filter isn’t the kind of product that sets your heart racing at first glance. It’s a practical accessory designed to safeguard a significant investment: your high-end spotting scope. From Kowa, a respected name in optics, comes this filter promises to add a layer of defense to your scope’s objective lens without compromising its light-gathering capabilities.

As someone who spends considerable time observing wildlife and surveying landscapes through a spotting scope, the vulnerability of the objective lens is always on my mind. A scratch, a smudge, even a persistent water spot can degrade image quality and impact the overall viewing experience. I sought the Kowa TP-105FT 105mm Multi-Coated Filter for its promise of protection without optical compromise.

Upon unboxing, the Kowa TP-105FT 105mm Multi-Coated Filter feels substantial. The metal ring is precisely machined, and the glass is visibly clean and clear. Compared to generic UV filters I’ve used on camera lenses, this feels like a purpose-built piece of equipment, fitting the Kowa TSN-99A scope perfectly.

While I considered using a generic 105mm filter, I opted for the Kowa filter because of the Kowa’s KR coating. This coating is meant to repel water and dirt, something generic filters won’t have. My initial feeling is one of cautious optimism; a protective filter is only worth it if it doesn’t degrade the image quality of the expensive optic it’s protecting.

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Real-World Testing: Putting Kowa TP-105FT 105mm Multi-Coated Filter to the Test

First Use Experience

My first test of the Kowa TP-105FT 105mm Multi-Coated Filter was during a week-long scouting trip in the high desert of eastern Oregon. The conditions were brutal: constant wind, blowing dust, and fluctuating temperatures. I used the scope to glass distant canyons and observe wildlife activity from elevated vantage points.

The Kowa TP-105FT 105mm Multi-Coated Filter proved its worth almost immediately. The KR coating effectively repelled the fine dust that coated everything else. Cleaning was a breeze, requiring only a quick wipe with a microfiber cloth. I didn’t notice any appreciable difference in image brightness or clarity.

There was no need for a getting-used-to period. The filter threaded onto the scope smoothly. Its low profile design ensured that it didn’t interfere with the scope’s focusing mechanism.

Extended Use & Reliability

After six months of regular use in varied environments, the Kowa TP-105FT 105mm Multi-Coated Filter has proven its durability and reliability. I’ve used it in heavy rain, snow, and even a few saltwater spray situations, and it has consistently protected the objective lens of my scope. The coating still beads water effectively, and the glass remains free of scratches.

The filter shows no signs of wear or tear. The metal ring is still perfectly round, and the threads are still smooth. The KR coating has not degraded. It is still effective at repelling water and makes the filter easy to clean.

In comparison to using the scope without a filter, I appreciate the peace of mind the Kowa TP-105FT 105mm Multi-Coated Filter provides. Knowing that the objective lens is protected from accidental scratches and environmental contaminants allows me to focus on the observation. It has certainly outperformed my expectations for a simple protective filter.

Breaking Down the Features of Kowa TP-105FT 105mm Multi-Coated Filter

Specifications

The Kowa TP-105FT 105mm Multi-Coated Filter boasts the following specifications:

• Objective Lens Diameter: 105mm. This ensures a perfect fit for the Kowa TSN-99A and TSN-99S spotting scopes, providing complete coverage and protection.
• Multi-Coated Optics: The filter features multiple layers of anti-reflective coatings. These coatings minimize glare and maximize light transmission, preserving image brightness and clarity.
• KR Coating: The Kowa Repelling (KR) coating is a hydrophobic layer that repels water, dirt, and oil. This makes cleaning easier and prevents water spots from forming on the lens.
• Black Finish: The filter has a sleek black finish. This minimizes reflections and contributes to the overall aesthetic of the spotting scope.
• Compatibility: Designed specifically for Kowa TSN-99A and TSN-99S spotting scopes. This ensures a proper fit and optimal performance.

These specifications are important because they directly impact the filter’s performance and its ability to protect the objective lens without compromising image quality. The multi-coating maximizes light transmission, preventing dimming or color distortion, while the KR coating simplifies cleaning and maintenance.

Performance & Functionality

The Kowa TP-105FT 105mm Multi-Coated Filter excels at its primary job: protecting the objective lens. The multi-coating ensures that image quality remains virtually unaffected, providing a clear and bright viewing experience. I noticed no degradation in resolution, color accuracy, or contrast when using the filter.

Its strength lies in its unobtrusive nature; it performs its protective function without hindering the scope’s optical performance. The Kowa TP-105FT 105mm Multi-Coated Filter meets expectations. The only downside is the price.

Design & Ergonomics

The Kowa TP-105FT 105mm Multi-Coated Filter features a simple and functional design. The metal ring is robust and easy to grip, making it easy to thread onto the scope. Its low profile ensures that it doesn’t interfere with the scope’s operation.

The filter’s weight is negligible, adding minimal bulk to the spotting scope. The build quality is excellent, reflecting Kowa’s commitment to quality and precision. The design is very user-friendly with no learning curve.

Durability & Maintenance

The Kowa TP-105FT 105mm Multi-Coated Filter is built to last. The high-quality materials and robust construction ensure that it can withstand the rigors of outdoor use. The KR coating makes maintenance simple. A quick wipe with a microfiber cloth is usually all that’s needed to remove dust, water spots, or fingerprints.

With proper care, this filter should last for many years. If the glass is damaged it cannot be easily repaired.

Accessories and Customization Options

The Kowa TP-105FT 105mm Multi-Coated Filter is primarily a standalone accessory, designed to integrate seamlessly with the Kowa TSN-99A and TSN-99S spotting scopes. There are no specific customization options or accessories that directly enhance the filter’s performance. However, the filter’s 105mm thread size may be compatible with some aftermarket lens caps designed for camera lenses.

It is compatible with all factory Kowa accessories for the TSN-99A. It is compatible with lens cleaning solutions and microfiber cloths designed for high-end optics.

Pros and Cons of Kowa TP-105FT 105mm Multi-Coated Filter

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Who Should Buy Kowa TP-105FT 105mm Multi-Coated Filter?

The Kowa TP-105FT 105mm Multi-Coated Filter is perfect for serious birdwatchers, wildlife observers, and hunters who own a Kowa TSN-99A or TSN-99S spotting scope. It’s also a must-have for anyone who frequently uses their scope in harsh environments where the objective lens is susceptible to damage.

If you’re primarily a casual observer and don’t subject your scope to demanding conditions, you might be able to get away with a less expensive generic filter. Anyone who does not own a Kowa TSN-99A or TSN-99S spotting scope should skip this product.

Conclusion on Kowa TP-105FT 105mm Multi-Coated Filter

The Kowa TP-105FT 105mm Multi-Coated Filter is a worthwhile investment for owners of Kowa TSN-99A and TSN-99S spotting scopes who prioritize protecting their valuable optics. Its exceptional optical performance, durable construction, and easy maintenance make it a top-tier choice for safeguarding your investment without sacrificing image quality.

The price is justified. A replacement objective lens for a high-end spotting scope would be far more expensive.

I would personally recommend it to anyone who wants to protect their Kowa TSN-99A or TSN-99S spotting scope. If you value the clarity and brilliance of your Kowa spotting scope, protecting it with the Kowa TP-105FT 105mm Multi-Coated Filter is a smart move.