ZEISS 421351-9970 Ld Plan Neofluar Korr Microscope Objective 20X /0.4

( Brand: Zeiss ), ( Manufacturer Part Number: 421351-9970 )

Review ZEISS Ld Plan neofluar 20x /0.4 Korr Microscope Objective

The **Zeiss LD Plan-Neofluar 20x/0.4 Korr** (catalog number 421351-9970) is a precision-engineered microscope objective designed to deliver exceptional optical performance, clarity, and reliability for a wide range of light microscopy applications. Part of Zeiss s renowned Neofluar series, this objective combines advanced optical design with robust mechanical construction to provide sharp, distortion-free imaging across its entire field of view. With a nominal magnification of 20x and a numerical aperture (NA) of 0.4, it strikes an ideal balance between working distance (16.0 mm) and field diameter (1.8 mm), making it well-suited for both routine laboratory work and specialized research. The "Korr" designation indicates that the objective is corrected for cover glass thickness, ensuring accurate imaging when used with standard 0.17 mm coverslips a common standard in microscopy. Crafted with Zeiss s signature attention to detail, this objective features a high-quality, multi-element lens system that minimizes chromatic and spherical aberrations, resulting in crisp, high-contrast images with minimal color fringing. Its durable, metal housing and precision-ground surfaces contribute to long-term stability and resistance to mechanical stress, while the integrated phase-contrast capability (when paired with compatible illumination) enhances the visibility of transparent or unstained specimens. Whether used in cell biology, histology, or materials science, the LD Plan-Neofluar 20x/0.4 excels in delivering consistent, high-quality visuals, making it a trusted choice for microscopists seeking reliability and optical excellence.

### **Pros and Cons of the Zeiss 421351-9970 LD Plan-Neofluar 20x/0.4 Korr Microscope Objective**

1. **High-Quality Optical Performance** The LD Plan-Neofluar series is known for its superior imaging clarity, contrast, and resolution, making it ideal for detailed microscopic examination. The corrected optical design minimizes aberrations, ensuring sharp and distortion-free images.

2. **Wide Field of View** With a 20x magnification, this objective provides a broad field of view compared to higher-magnification objectives, allowing for easier observation of larger samples without excessive cropping.

3. **Korr (Corrected) Design** The "Korr" designation indicates that the objective is corrected for common aberrations, including chromatic and spherical aberrations, which enhances image quality across different wavelengths of light.

4. **Compatibility with Zeiss Microscopes** As a Zeiss objective, it is designed to work seamlessly with Zeiss microscope systems, ensuring optimal performance with minimal adjustments.

5. **Durability and Precision** Zeiss objectives are built to high standards, with robust construction that ensures longevity and reliable performance under regular use.

6. **Versatility for Biological and Material Sciences** The 20x magnification is well-suited for a wide range of applications, including cell biology, histology, and material science, where moderate magnification is preferred for initial sample assessment.

7. **Compatibility with Digital Imaging** The objective is suitable for use with digital cameras and microscopy software, making it a good choice for modern research and documentation needs.

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1. **Higher Cost** Zeiss objectives are premium products, and this particular model is likely more expensive than alternatives from other manufacturers (e.g., Olympus, Nikon, or Leica). The price may be a significant investment, especially for budget-conscious users.

2. **Limited Working Distance** At 20x magnification, the working distance is relatively short (typically around 0.6 0.8 mm), which can make sample preparation and manipulation more challenging compared to lower-magnification objectives.

3. **Requires Proper Maintenance** High-quality objectives demand careful handling to avoid scratches or contamination. Improper cleaning or mishandling can degrade performance over time.

4. **Compatibility Limitations** While it works well with Zeiss microscopes, it may not be fully optimized for non-Zeiss systems, potentially requiring additional adjustments or adapters.

5. **Overkill for Basic Use** If you primarily require low-magnification objectives for simple observations (e.g., general lab work or teaching), a lower-cost alternative might suffice without sacrificing too much image quality.

6. **Potential for Overuse** For applications where higher magnifications (e.g., 40x or 60x) are more critical, investing in a 20x objective alone may not provide the best return on investment. A set of objectives covering multiple magnifications is often more practical.

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The Zeiss 421351-9970 LD Plan-Neofluar 20x/0.4 Korr objective is an excellent choice for users who prioritize optical performance, durability, and compatibility with Zeiss systems. Its corrected design and high resolution make it ideal for detailed microscopic work, particularly in fields where clarity and contrast are essential. However, its cost and limited working distance may not justify the purchase for users with basic needs or those working with non-Zeiss equipment.

- **Buy if:** You are working in a research or professional setting where image quality is critical, you already own or plan to use a Zeiss microscope, and you require a reliable 20x objective for detailed observations. It is also a good addition to an existing set of objectives if you lack a high-quality 20x option.

- **Consider alternatives if:** You are on a tight budget and can compromise slightly on image quality, or if you primarily use lower magnifications and do not need Zeiss-specific features. In such cases, a high-quality 20x objective from another reputable brand (e.g., Olympus Plan Fluorite or Nikon Plan Fluor) may offer similar performance at a lower cost.

- **Pair with:** A complementary set of objectives (e.g., 10x, 40x, 100x) to cover a broader range of magnifications for versatile use. Additionally, ensure your microscope is properly aligned and maintained to maximize the objective s performance.

Details:

It has not been tested. Please see pictures for more detail. There are some minor scratches, scuffs, and/or blemishes on the item. Functionality is UNKNOWN.

Function: This item is USED.

part #: 4213519970 prices

• $480.00-$1049.00

specifications microscopepartzo:

• brand: Zeiss
• mpn: 421351-9970

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• # reviews: 2
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general microscopepartzo:

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

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• policy: No Returns

offer microscopepartzo:

• best offers: True
• options: Ship-to-home
• availability: In Stock
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• quantity: 1
• started: February 18, 2026

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