ZEISS 440135 Fluar Microscope Objective 10X/0.50 /0.17

( Brand: Zeiss ), ( Manufacturer Part Number: 440135 ), ( Country Of Origin: Germany ), ( Intended Use/discipline: Biological Laboratory )

Review ZEISS Fluar 10x/0.50 /0.17 Microscope Objective

The **Zeiss 440135 Fluar 10 /0.50/0.17** microscope objective is a precision-engineered optical component designed for high-performance imaging in both brightfield and fluorescence microscopy applications. Part of Carl Zeiss s renowned Fluar series, this objective combines exceptional optical clarity with robust mechanical construction to deliver sharp, distortion-free images across a broad field of view. With a nominal magnification of 10 and a numerical aperture (NA) of 0.50, it strikes an ideal balance between resolution and working distance, making it well-suited for routine laboratory work, histology, and general biological studies. The objective s long working distance of 0.17 millimeters ensures minimal sample disturbance, allowing for comfortable observation of thicker specimens or those mounted in immersion media without the risk of accidental contact with the cover glass. Crafted with Zeiss s proprietary **Fluorite glass**, the lens elements are optimized to minimize chromatic aberrations, ensuring consistent color fidelity and high contrast across the visible spectrum, from ultraviolet to near-infrared wavelengths. This makes the Fluar 10 particularly versatile for applications requiring precise color differentiation, such as cytology, cell biology, or material science. The durable, metal-bodied design features a **0.17-inch (4.3 mm) thread mount**, compatible with most standard microscope tubes, while the **parfocalized** construction ensures seamless integration with other Zeiss objectives for seamless multi-magnification workflows. Whether used in a research lab, clinical setting, or educational environment, the Fluar 10 /0.50/0.17 objective exemplifies Zeiss s commitment to optical excellence, offering a reliable, long-lasting solution for those demanding both clarity and consistency in their microscopy observations.

The Zeiss 440135 Fluar 10x/0.50/0.17 microscope objective is a high-quality, long-working-distance objective designed for brightfield and fluorescence applications. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High Numerical Aperture (NA 0.50)**

- Offers a good balance between resolution and working distance, making it suitable for observing moderately thin specimens with reasonable detail. A higher NA than many standard 10x objectives (which often have NA 0.25 or 0.30) improves light-gathering capability and resolution, though not as high as oil-immersion objectives.

2. **Long Working Distance (0.17 mm)**

- The 0.17 mm working distance is relatively long for a 10x objective, allowing for easier manipulation of specimens, immersion in liquids, or the use of additional accessories (e.g., coverslips, slides, or sample holders). This is particularly useful for thick or opaque samples that would be difficult to focus with shorter working distance objectives.

3. **Fluorite Glass Construction**

- The "Fluor" designation indicates the objective uses fluorite glass, which reduces chromatic aberration (color fringing) and spherical aberration compared to standard glass objectives. This results in sharper, more accurate images with better color fidelity, especially important for fluorescence microscopy where color accuracy is critical.

4. **Durability and Precision**

- Zeiss objectives are known for their robust construction, precision engineering, and long-term reliability. The Fluar series is particularly well-regarded for its optical performance and durability, making it a solid investment for professional or high-demand applications.

5. **Compatibility with Fluorescence**

- The objective is explicitly designed for fluorescence microscopy, meaning it is optimized to minimize autofluorescence and maximize signal transmission. This is beneficial for imaging fluorescent dyes or proteins in biological samples.

6. **Wide Field of View**

- A 10x objective provides a broad field of view, making it ideal for low-magnification screening, surveying large areas of a sample, or observing entire cells/tissues without needing to switch to lower magnification objectives.

7. **Minimal Aberrations**

- The combination of fluorite glass and Zeiss optical design reduces common aberrations (e.g., distortion, curvature of field), resulting in a flatter image plane and better overall image quality.

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### **Cons**

1. **Cost**

- Zeiss objectives are premium-priced, and the Fluar series is no exception. The 10x Fluar will likely cost significantly more than comparable objectives from other manufacturers (e.g., Nikon Plan Fluor, Olympus UPlanFL). This may be a barrier for budget-conscious users or those in educational settings with limited funding.

2. **Limited Magnification for Detailed Work**

- While the NA of 0.50 is higher than many 10x objectives, it is still relatively low compared to higher-magnification objectives (e.g., 40x or 60x oil objectives). For highly detailed cellular or subcellular imaging, users may need to switch to higher magnification objectives, which could require additional objectives or a more complex microscope setup.

3. **Working Distance Trade-off**

- Although the 0.17 mm working distance is long for a 10x objective, it is shorter than some other long-working-distance objectives (e.g., certain 10x/0.30 or 10x/0.25 objectives). This may limit its use with very thick samples or when additional space is required for sample manipulation.

4. **Requires High-Quality Microscope**

- To fully utilize the optical performance of a Zeiss Fluar objective, the microscope itself must be of high quality, particularly the condenser, illumination system, and camera/eyepieces. Poor-quality components can limit the objective s potential, making it less effective than expected.

5. **Maintenance Sensitivity**

- High-end objectives like the Fluar are sensitive to dust, scratches, and improper handling. They require careful cleaning and storage to maintain optical performance, which may be a concern in busy or less controlled environments.

6. **Limited Availability of Replacements**

- Zeiss objectives are less commonly found in used markets compared to Nikon or Olympus objectives. If the objective fails or needs replacement, finding a compatible or identical model may be more difficult and expensive.

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### **Conclusion**

The Zeiss 440135 Fluar 10x/0.50/0.17 objective is an excellent choice for users who prioritize optical quality, durability, and performance in fluorescence microscopy. Its fluorite glass construction, long working distance, and high NA make it well-suited for applications requiring sharp, aberration-free images with minimal color fringing. However, its high cost, the need for a compatible microscope setup, and the trade-offs in working distance for higher magnification work may not justify the investment for all users.

For **professional researchers, clinical labs, or advanced educational settings** where image quality and reliability are critical, the Fluar objective is a strong recommendation. For **budget-conscious users, students, or those working with simpler samples**, a lower-cost alternative (e.g., a Plan Fluor or UPlanFL from Nikon or Olympus) may offer comparable performance at a fraction of the price.

If fluorescence microscopy is a primary application and budget is not a constraint, the Zeiss Fluar 10x is a worthwhile investment. For general brightfield work or lower magnification needs, the benefits may be less pronounced. Always consider the specific requirements of your samples and microscope setup before purchasing.

Details:

I'm not a microscope dealer or expert. I looked at the lens with an eyepiece and did not see any lamination, cracks or scratches on. Includes the following microscope objective: 1 - ZEISS 440135 FLUAR 10X / 0.50 /0.17, This may need to be cleaned.

part #: 440135 prices

• $400.00-$1100.00

specifications microscopepartzo:

• brand: Zeiss
• mpn: 440135
• country of origin: Germany
• intended use/discipline: Biological Laboratory

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• carrier: FedEx
• cost: $27.44
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offer microscopepartzo:

• started: March 16, 2026
• availability: In Stock
• options: Ship-to-home
• quantity: 1
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• # reviews: 2627
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• city: Mechanicsville, Virginia

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• policy: No Returns

general microscopepartzo:

• Medical/Lab Equipment Attachments Accessories > Microscope Parts Accessories > Other Microscope Parts Accessories
• condition: Used

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