GLASS Coated Filter 4012240111961 40.5MM 091

( Brand: Glass ), ( Part Type: Glass Filter ), ( Style: Camera Other Accessories ), ( Item Weight: 0.09 ), ( Filter Color: Red ), ( UPC: 012240111961 )

Review GLASS 40.5mm #091 Multi Coated Filter Dark Red #29

The **012240111961 40.5mm 091 Coated Glass Filter 29** is a precision-engineered optical filter designed for high-performance imaging, photography, and scientific applications where color accuracy, contrast, and light control are paramount. This filter belongs to the **091 series**, a specialized line of optical glass developed to minimize chromatic aberrations while maintaining exceptional clarity and color fidelity. The **40.5mm diameter** makes it compatible with a wide range of lenses, from standard DSLR mounts to medium-format systems, ensuring versatility for both professional photographers and researchers. The **coated glass** construction incorporates advanced multi-layer dielectric coatings that optimize light transmission while reducing reflections, flare, and ghosting critical for achieving sharp, distortion-free images in demanding lighting conditions. Whether used in astrophotography to enhance celestial details, in macro photography to isolate specific wavelengths, or in laboratory settings for precise spectral analysis, this filter delivers consistent performance with minimal light loss. Its durable, scratch-resistant surface ensures longevity, making it ideal for both studio and fieldwork applications where reliability is essential. The **091 series** is particularly renowned for its ability to maintain neutral density without introducing color casts, making it a preferred choice for photographers seeking unaltered, true-to-life reproductions. Overall, this filter exemplifies precision craftsmanship and optical engineering, offering photographers and scientists a dependable tool for achieving professional-grade results.

### **Analysis of the 012240111961 (40.5mm, 091 Coated Glass Filter 29)**

This appears to be a **B W (B&W) 091 (ND3 or ND4) neutral density filter** with a **40.5mm thread size**, likely intended for photography. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High-Quality Construction**

- B W is a well-regarded brand known for durable, high-quality glass filters. Their coatings are designed to minimize reflections and maintain image clarity.

- The **091 series** is a **neutral density (ND) filter**, meaning it reduces light entering the lens without altering color balance. This is useful for long exposures, slow shutter speeds, or achieving a shallow depth of field in bright conditions.

2. **Precise Neutral Density (ND3 or ND4)**

- An **ND3 filter** reduces light by **3 stops**, while an **ND4** reduces it by **4 stops**. This allows photographers to use wider apertures (e.g., f/1.4 at midday) or slower shutter speeds (e.g., 1/15s for silky water effects) without overexposing the image.

- The **091 series** is particularly useful for landscape, architectural, and creative photography where controlled light is critical.

3. **Multi-Coated for Minimal Distortion**

- B W s multi-coating reduces flare, ghosting, and internal reflections, ensuring sharp, high-contrast images even in bright sunlight.

- The coating also helps maintain color fidelity, which is essential for accurate post-processing.

4. **Durable and Weather-Sealed**

- B W filters are built to withstand outdoor use, including moisture and dust. The **40.5mm thread** suggests it may be designed for mirrorless or DSLR systems with compatible lens hoods.

5. **Versatile Use Cases**

- Ideal for **long exposures** (e.g., waterfalls, cityscapes, light trails).

- Useful for **creative bokeh effects** in bright conditions where stopping down the aperture would lose sharpness.

- Works well in **video** for cinematic slow-motion effects.

6. **Compatibility with Lens Hoods**

- The **40.5mm size** is common for many lenses, making it easy to attach without obstruction. Some lens hoods may fit snugly, reducing vignetting.

---

### **Cons**

1. **Limited to 40.5mm Thread Size**

- If you own lenses with different thread sizes (e.g., 52mm, 58mm, 67mm, or 72mm), you ll need additional **step-up rings** to use this filter. This adds cost and bulk.

- If your primary lenses are larger, a **universal filter system** (e.g., 77mm or 82mm) might be more practical long-term.

2. **Potential for Vignetting**

- While B W filters are well-coated, some wide-angle lenses may still experience slight vignetting (darkening at the edges) when using ND filters. This can be corrected in post-processing but may require extra effort.

3. **Cost Relative to Alternatives**

- B W filters are premium-priced. For photographers on a budget, alternatives like **Lee Filters, K&F Concept, or Hoya** offer similar ND filters at lower costs with comparable quality.

- If you already own a **variable ND filter**, this fixed ND3/ND4 may feel redundant unless you specifically need the precise density.

4. **Weight and Bulk**

- Glass filters add weight to your lens, which can be noticeable over long shooting sessions. If you frequently shoot handheld, this may not be ideal.

- They also increase the overall size of your lens setup, which can be cumbersome for travel.

5. **No Variable ND Functionality**

- Unlike **variable ND filters**, this is a **fixed density** (ND3 or ND4). If you need adjustable light reduction, you d need to carry multiple filters or rely on a variable alternative.

6. **Potential for Scratches**

- While durable, glass filters can scratch if mishandled. Always use a **filter holder or case** to protect them during transport.

---

### **Conclusion**

The **B W 012240111961 (40.5mm, 091 ND3/ND4)** is a **high-quality, reliable neutral density filter** that excels in controlled light scenarios. It is particularly valuable for photographers who prioritize **sharpness, color accuracy, and durability** over cost savings. The **multi-coating** ensures minimal distortion, making it suitable for both photography and video work.

However, its **limited thread size (40.5mm)** may restrict its use with larger lenses, and the **fixed density** means it won t replace a variable ND filter. If you frequently shoot with wide-angle or macro lenses, you may need additional step-up rings, adding to the overall cost.

For **landscape, architectural, or creative photographers** who need precise ND control and high image quality, this filter is a **strong recommendation**. For those on a budget or with varying lens sizes, exploring **alternative brands or variable ND filters** may be more practical.

---

### **Recommendation**

- You own **40.5mm lenses** and need a **reliable, high-quality ND3/ND4 filter** for long exposures or creative effects.

- You prioritize **minimal color shift and sharpness** in your images.

- You frequently shoot in **bright conditions** where stopping down the aperture would lose sharpness.

- You already have a **filter system** (e.g., a 40.5mm holder) and don t mind the fixed density.

- You shoot with **larger lenses** (e.g., 52mm ) and would need multiple step-up rings.

- You prefer **variable ND filters** for flexibility.

- You re on a **tight budget** brands like **Lee Filters, K&F Concept, or Hoya** offer similar ND filters at lower prices.

- You primarily shoot **portrait or low-light photography**, where ND filters are less critical.

This is a **solid, professional-grade ND filter** that justifies its cost for serious photographers who demand the best in image quality. If your workflow aligns with its strengths, it is a **worthwhile investment**. Otherwise, evaluate whether a **variable ND or a different thread size** would better suit your needs.

Details:

No questions asked. It is indispensable for tonal separation in still-life photography and the reproduction of documents which have become illegible. Fast and Free Shipping You're already purchasing the item. Rest assured that you're getting a good deal when purchasing with us.

B W 40.5mm #091 Multi Coated Glass Filter - Dark Red #29: The use of this filter gives a surrealistic effect in landscape and architectural photography by producing storm-like cloud effect, moonlight wood. Features Multi coated for flare prevention. Filter factor is approx.

specifications filtecam:

• brand: Glass
• part type: Glass Filter
• style: Camera Other Accessories
• item weight: 0.09
• filter color: Red
• upc: 012240111961

general filtecam:

• Cameras Photo > Lenses Filters > Filters
• condition: Open box

returns filtecam:

• policy: No Returns

shipping filtecam:

• transit: 7-13 Days
• class: Economy
• cost: $10.00
• service: UPS Ground Saver
• carrier: UPS
• type: Fixed

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• credit card: Discover

offer filtecam:

• quantity: 1
• started: April 21, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock

seller filtecam:

• # reviews: 13
• city: Troutdale, Oregon
• rating: 100.0%

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