Shanghai Longway Special Glass Co., Ltd.
| Payment Terms | D/P,T/T,Western Union |
| Supply Ability | 10000 Pieces per Month |
| Packaging Details | electrolytic capacitor paper,foam,carton |
| Shape | Achromatic Convex-Concave |
| Surface quality | 40/20 |
| Transmission | over 90% |
| Coating | available |
| Application | Optics and Laser |
| OEM | available |
| Brand Name | LONGWAY |
| Model Number | LW16092024 |
| Certification | ISO9001 |
| Place of Origin | Shanghai, China |
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Product Specification
| Payment Terms | D/P,T/T,Western Union | Supply Ability | 10000 Pieces per Month |
| Packaging Details | electrolytic capacitor paper,foam,carton | Shape | Achromatic Convex-Concave |
| Surface quality | 40/20 | Transmission | over 90% |
| Coating | available | Application | Optics and Laser |
| OEM | available | Brand Name | LONGWAY |
| Model Number | LW16092024 | Certification | ISO9001 |
| Place of Origin | Shanghai, China | ||
| High Light | BK-7 Glass Doublet Lens ，High Precision BK7 Achromatic Lens ，Optical Lens for Microscope/Telescope | ||
High Precision BK7 Glass Achromatic Doublet Lens for Microscope/Telescope
Core Elements: Precision-bonded pair of optical elements.
Primary Material: Crown Glass: High-quality BK7 (Schott designation) borosilicate glass for the positive (converging) element. Renowned for excellent homogeneity, transmission (approx. 92% in visible spectrum), and low bubble/inclusion content.
Secondary Material: Flint Glass: Typically a higher dispersion glass (e.g., F2, SF2) for the negative (diverging) element.
Bonding: Cemented using high-transparency, low-stress optical adhesive (e.g., Canada balsam historically, modern epoxies/UV-cured adhesives).
Achromatic Design: Significantly reduces chromatic aberration by bringing two primary wavelengths (e.g., red/C & blue/F lines) to a common focal point. Minimizes color fringing ("purple haze").
High Precision: Features tight tolerances on centering (<3 arcmin), surface figure (λ/4 or better), surface quality (scratch-dig 40-20 or finer), and focal length.
Wavefront Accuracy: Optimized for minimal wavefront distortion.
Low Stress: Manufacturing and bonding processes minimize internal stress, preserving optical performance.
Durability: BK7 offers good chemical resistance and mechanical stability.
Chromatic Aberration Correction: The core purpose is to eliminate color blur caused by dispersion in single-element lenses, providing sharper, truer color images.
Spherical Aberration Reduction: The doublet design also helps minimize spherical aberration, improving overall image sharpness and contrast, especially off-axis.
Precision Focusing: Delivers high-resolution, high-contrast images by focusing a broad spectrum of light accurately onto a single plane.
Microscopes:
Essential in objective lenses (especially higher magnifications like 40x, 60x, 100x oil immersion) for crisp, color-accurate specimen imaging (biology, pathology, materials science).
Used in eyepieces for enhanced viewing clarity and reduced eye strain.
Telescopes:
Fundamental component in objective lenses for refracting telescopes (achromats).
Key element in high-quality eyepieces (e.g., Kellner, Plössl designs) for planetary and lunar observation, minimizing false color.
Used in Barlow lenses and correctors.
Collimators & Other Instruments: Used where precise, color-corrected collimation or imaging is required (e.g., laser alignment, inspection systems).
| Name | Optical Achromatic Lens |
| Material | Optical glass, Qurartz glass, borosilicate glass |
| Diameter Tolerance | +0/-0.15 mm |
| Thickness Tolerance | +/-0.15mm |
| Processed | by grinding, polishing |
| Surface Quality | 60/40,40/20 |
| Material Quality | no scratches and air bubble |
| Transmission | above 90% |
| Chamfer | 0.1-0.5 mm x 45° |
| Surface Coating | Available |
| Usage | Photography, Lighting system |
Company Details
Business Type:
Manufacturer,Agent,Exporter,Trading Company,Seller
Year Established:
2008
Total Annual:
1000000-5000000
Employee Number:
30~100
Ecer Certification：
Verified Supplier
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 busines... 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 busines...
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