K-F CONCEPT AU-KF01.2540V1 Lens Filter Stops 67MM ND2-32 1/5

( Brand: K-f Concept ), ( Manufacturer Part Number: AU-KF01.2540V1 ), ( Part Type: Filter ), ( Itemheight: 28 ), ( Itemlength: 100 ), ( Packageheight: 24 ), ( Packagelength: 102 )

Review K F CONCEPT 67mm Variable Lens Filter 1-5 Stops

The **AU-KF01.2540V1 67mm ND2-32 Variable Neutral Density Filter** is a high-performance, professional-grade optical accessory designed to elevate the capabilities of photographers and videographers working with medium-format and large-sensor cameras. Crafted with precision engineering, this filter integrates a seamless, screw-in mounting system compatible with a 67mm filter thread, making it an ideal addition to a versatile photography or cinematography setup. The variable neutral density (ND) range of **ND2 to ND32** equivalent to **1 to 5 stops** of light attenuation allows users to achieve effortless control over exposure in bright conditions without adjusting shutter speeds, ISO, or aperture. This flexibility is particularly invaluable for long-exposure photography, cinematic slow-motion, or maintaining consistent lighting in dynamic environments where natural light fluctuates rapidly.

Constructed from **high-quality optical glass**, the filter ensures minimal color cast and maximum clarity, preserving the integrity of your image while delivering smooth, uninterrupted transitions between ND strengths. The variable design eliminates the need to switch between multiple fixed ND filters, saving time and reducing the risk of misalignment or ghosting. Whether capturing the delicate flow of waterfalls, the ethereal motion of clouds, or the cinematic blur of a bustling cityscape, this filter enables photographers to harness the full potential of their lenses while maintaining professional-grade image quality. Its robust build and durable construction also ensure longevity, making it a reliable investment for both studio and on-location work. Ideal for medium-format cameras like Hasselblad, Mamiya, or Phase One systems, as well as large-sensor DSLRs and mirrorless cameras, the AU-KF01.2540V1 is a versatile tool that bridges the gap between photography and videography, offering seamless integration into creative workflows.

The **Au-KF01.2540V1 67mm ND2-32 (1-5 stops) variable neutral density filter** is a popular choice for photographers, particularly those working in video or long-exposure photography. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Variable Neutral Density (ND) Range**

The filter offers a continuous adjustment from **ND2 (1 stop) to ND32 (5 stops)**, making it highly versatile for different lighting conditions. This eliminates the need to carry multiple fixed ND filters, as you can fine-tune exposure without switching.

2. **High-Quality Optics**

Au-KF (a brand under **Au-Tech**) is known for producing high-quality glass with minimal color cast and distortion. The multi-coated optics ensure sharp, clear images even at wide apertures.

3. **Durable Construction**

The filter is built with a **metal ring and glass**, making it sturdy and resistant to scratches. The threaded design (67mm) is standard, ensuring compatibility with most lenses.

4. **Polarizing Effect (Optional)**

Some users report that the filter has a slight **polarizing effect**, which can help reduce glare and enhance contrast in outdoor scenes. However, this is not the primary function and may vary slightly between units.

5. **Good Value for Money**

Compared to premium brands like **Lee, B W, or K&F Concept**, this filter offers similar performance at a lower cost, making it an attractive option for budget-conscious photographers.

6. **Easy to Use**

The **twist-to-adjust mechanism** allows for quick exposure compensation without needing additional tools. This is particularly useful in video work where real-time adjustments are necessary.

7. **Low Light Performance**

The **ND32 (5 stops) setting** is useful for long-exposure photography in bright daylight, allowing for smooth water, star trails, or cityscapes without overexposure.

8. **Minimal Vignetting**

Unlike some cheaper filters, this one does not introduce significant vignetting, ensuring consistent exposure across the entire frame.

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### **Cons**

1. **Potential for Slight Color Shift**

While generally well-reviewed for neutrality, some users report a **very subtle magenta or green tint** in extreme conditions (e.g., high contrast scenes). This is not as pronounced as with cheaper filters but may still be noticeable in post-processing.

2. **Not Fully Weather-Sealed**

The filter lacks a **full weather-sealing**, meaning it may not be ideal for extreme conditions like heavy rain or dust. If durability in harsh environments is a priority, a more premium filter might be better.

3. **Thread Compatibility Issues (Occasional Reports)**

Some users have experienced **loose threading** or difficulty attaching it securely to certain lenses. While rare, this could be a concern if the filter is frequently removed and reattached.

4. **Limited Brand Reputation for Customer Support**

Au-Tech is a relatively newer brand compared to established names like **Lee Filters or Hoya**. If issues arise, customer service and warranty support may not be as robust.

5. **Not Ideal for Extreme Low-Light Conditions**

While the **ND32 setting is strong**, it may not be sufficient for **very low-light scenarios** (e.g., night photography without additional lighting). A **ND64 or ND1000 filter** might be needed for those cases.

6. **Potential for Ghosting or Flare in Extreme Cases**

Like all glass filters, this one can introduce **ghosting or lens flare** in high-contrast situations (e.g., shooting directly into the sun). While minimal, this is a consideration for landscape and architectural photographers.

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### **Conclusion**

The **Au-KF01.2540V1 67mm ND2-32 variable ND filter** is a **strong, budget-friendly alternative** to high-end filters, offering **excellent versatility, sharp optics, and durability**. It excels in **video work, long exposures, and general photography** where adjustable ND is beneficial.

However, it is **not without minor drawbacks** primarily **slight color shifts in extreme cases, lack of full weather-sealing, and potential thread compatibility issues**. For most photographers, these trade-offs are **minor compared to the convenience and cost savings** it provides.

If you prioritize **performance, value, and ease of use**, this filter is a **solid choice**. However, if you work in **extreme conditions, require absolute neutrality, or need premium customer support**, investing in a **Lee, B W, or K&F Concept filter** may be worth the extra cost.

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### **Recommendation**

- You need a **versatile, adjustable ND filter** for video or long exposures.

- You are working within a **budget** and want high-quality performance without premium pricing.

- You primarily shoot in **moderate to bright lighting conditions**.

- You prefer **twist-to-adjust convenience** over fixed ND filters.

- You require **absolute color neutrality** in high-contrast scenes.

- You work in **extreme weather conditions** (rain, dust, high humidity).

- You need **long-term warranty and customer support**.

- You frequently shoot in **very low light** and may need a **stronger ND range (e.g., ND64 )**.

**Final Verdict:** The **Au-KF01.2540V1 is an excellent mid-range variable ND filter** that delivers **great value** for most photographers. It is **highly recommended for those who prioritize functionality and cost efficiency** over brand prestige.

Details:

1-5 Stops Light Reduction Take complete control over exposure settings with the variable neutral density filter, offering stops of light reduction. Effortlessly contrail shutter speeds and support widen apertures in bright day for stunning effects. K F CONCEPT 67mm Variable ND2-32 Lens Filter 1-5 Stops. 18 Multi-Layer Coatings K F Concept optical engineers developed a new Nano coating layer technology,protecting valued lens and the filter durable enough.

Compatible Note This ND filter suits all 67mm lenses. Premium Optical Glass Made by importing AGC glass, the filter reduces light intake without affecting overall color balance and reflections glare, ensuring superior image quality. No X Cross Our frame self-lock design and hard stops at each end of the exposure range-control filter ring have flawlessly solved black problem commonly seen in variable ND filters.

part #: aukf012540v1 prices

• $43.99-$132.99

specifications filtecam:

• brand: K-f Concept
• mpn: Au-kf01.2540v1
• part type: Filter
• itemheight: 28
• itemlength: 100
• packageheight: 24
• packagelength: 102

shipping filtecam:

• type: Fixed
• transit: 5-8 Days
• class: Standard
• service: Standard
• cost: $0.00

offer filtecam:

• sold: 0
• quantity: 1
• started: May 2, 2026
• availability: In Stock
• options: Ship-to-home

general filtecam:

• condition: New
• Cameras Photo > Lenses Filters > Filters

returns filtecam:

• paid by: Buyer
• method: Money back
• time: 30 Days
• policy: Returns Accepted

seller filtecam:

• # reviews: 228
• rating: 98.6%
• city: Denver, Colorado

payments filtecam:

• other
• wallet: Paypal
• credit card: Diners-club

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