Precision AR-coating Achromatic Glass Lenses For Color-corrected Binoculars

• Material:

  • Achromatic Doublet: Precisely bonded pair of optical glass elements.

  • Crown Glass (Low Dispersion): Typically types like BK7, K5, or specialty low-dispersion glasses (e.g., Schott N-BK7, Ohara S-BSL7). Possesses a low Abbe number.

  • Flint Glass (High Dispersion): Typically types like F2, SF2, or specialty flints (e.g., Schott N-SF2, Ohara P-SFHT53). Possesses a high Abbe number.

  • Cement: High-purity, transparent optical adhesive with matching refractive index and thermal stability.

• Key Properties:

  • Chromatic Aberration Correction: The primary function. Combines crown and flint glasses to bring two primary wavelengths (typically red & blue) to a common focus, drastically reducing color fringing (e.g., purple halos).

  • High Transmission & Contrast: Multi-layer Anti-Reflective (AR) coatings applied to all air-glass surfaces. Minimizes surface reflections (<0.5% per surface typical), maximizing light throughput (>99% total possible), enhancing image brightness and contrast, especially in low light.

  • Precision Figure & Surface Quality: Tightly controlled spherical surfaces (often λ/4 or better wavefront error) and low surface roughness (<5Å RMS) minimize scatter and distortion.

  • Accurate Centration & Alignment: Critical for sharp imagery; elements cemented and mounted with minimal decenter and tilt error.

  • Durability: Hard, environmental AR coatings resist abrasion, humidity, and cleaning.

• Core Function:

  • To provide sharp, high-contrast, color-accurate images in binocular objectives or eyepieces.

  • Achromatism: Corrects longitudinal chromatic aberration across the visible spectrum.

  • AR Coating: Maximizes light transmission, minimizes ghosting/flare from internal reflections, and boosts contrast.

• Primary Applications:

  • High-Quality Binoculars: Essential for premium birding, hunting, astronomy, marine, and general-use binoculars demanding sharp, bright, color-neutral views.

  • Spotting Scopes & Telescopes: Used in objectives and eyepieces for terrestrial and astronomical viewing.

  • Riflescopes & Optical Sights: Critical for clear target acquisition and color fidelity.

  • Precision Optical Instruments: Microscopes, surveying equipment, specialized imaging systems requiring color correction and high light throughput.

  • Photographic Lenses (Historical/Specialized): Found in some classic or specialized lenses where chromatic correction and transmission were paramount.

• Manufacturing Considerations (Precision Aspect):

  • Precision Glass Selection: Matching Abbe numbers and partial dispersion is crucial for effective correction.

  • Precision Surfacing & Cementing: Ultra-fine grinding/polishing and meticulous alignment during cementing are mandatory.

  • Advanced AR Coating: Precise deposition of multiple dielectric layers tailored for broadband visible light performance (e.g., "V-coating" for deep transmission valleys). Coating uniformity is vital.

  • Strict Tolerances: Tight control on radii, thickness, centration, wedge, and surface quality throughout the process.

In essence: Precision AR-coated achromatic glass lenses are the cornerstone of high-performance visual optics like binoculars. By combining two specific glass types into a doublet, they correct chromatic aberration for true color rendition. Advanced multi-layer AR coatings applied to all surfaces dramatically increase light transmission, boost contrast, and eliminate distracting reflections. This synergy delivers the bright, sharp, color-faithful, and high-contrast images demanded by discerning users in nature observation, sports, astronomy, and professional applications.

Introduction

Shanghai Longway Special Glass Co., Ltd. has been a professional supplier in the glass industry for over 20 years. With its expertise spanning across various fields, including optics, laser, imaging, and lighting etc., the company has established itself as a trusted partner for businesses worldwide. The company's commitment to providing high-quality glass products and services has earned it a reputation as a reliable supplier of choice among major corporations and small businesses alike.

Our Team

The team at Shanghai Longway Special Glass Co., Ltd. consists of professional experts with extensive experience in the field of glass manufacturing. These skilled technicians have honed their expertise through years of hands-on training and continuous education, ensuring that they remain up-to-date on the latest techniques and technologies.

Our Capabilities

Shanghai Longway Special Glass Co., Ltd.'s capabilities include:

 Cutting: Advanced cutting equipment allows for precise cuts in a variety of glass types.

Grinding: High-speed grinding machines enable efficient surface preparation.

Polishing: Automated polishing systems guarantee exceptional optical clarity.

Molding: Sophisticated molding techniques permit the creation of intricate shapes and designs.

Blowing: Expertise in blow-and-form processing enables the production of hollow glass products, such as bottles and jars.

Tempering: Heat-treating equipment ensures that glass products meet or exceed industry standards for thermal shock resistance.

Our Raw Materials

The company offers a wide range of raw materials and processed glass products, normally including:

Optical Glass: High-quality optical glass suitable for precision applications.

Borosilicate Glass: Durable borosilicate glass ideal for laboratory equipment and medical devices.

Quartz Glass: Pure quartz glass utilized in various industries, including electronics and optics.

Float Glass: Large sheets of float glass suitable for architectural applications and flat glass products.

Soda Lime Glass: Economical soda lime glass used for a wide range of industrial and commercial applications.

Our Quality Control Process

At Shanghai Longway Special Glass Co., Ltd., quality control is an integral part of the manufacturing process. Each product undergoes rigorous inspection to ensure that it meets or exceeds customer expectations. This commitment to excellence has earned the company a reputation as a trusted supplier of high-quality glass products.

Our Commitment to Excellence

At Shanghai Longway Special Glass Co., Ltd., we are committed to delivering exceptional quality glass products that meet or exceed customer expectations. Our team of professional experts is dedicated to providing expert advice and assistance in selecting the most suitable materials and processing techniques for specific needs. We take pride in our state-of-the-art facility, equipped with cutting-edge machinery and technology, ensuring that every product meets the highest standards.

Why Choose Us?

Shanghai Longway Special Glass Co., Ltd. is a trusted supplier of high-quality glass products, committed to delivering exceptional quality, innovation, and customer satisfaction. With over 20 years of experience and expertise spanning across various fields, we are well-positioned to meet the evolving needs of businesses worldwide. We look forward to serving your needs and meeting your expectations.