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Negative Meniscus Lenses
Keyword：
Negative Meniscus Lenses
Category：
- Description
- Cas'Tech Class
- Parameters
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Introduction:
CASTECH offers an extensive line of spherical lenses, including Plano-Convex Lenses, Plano-Concave Lenses, Bi-Convex Lenses, Bi-Concave Lenses, Meniscus Lenses, Negative Meniscus Lenses as well as Achromatic Lenses. CASTECH’s precision spherical lenses are made from a wide variety of optical substrates such as Optical glass, Calcium Fluoride(CaF2), Magnesium Fluoride(MgF2), Fused Silica, Sapphire, Germanium (Ge), Silicon (Si), Zinc Selenide (ZnSe). Together with our multiple coating designs covering wavelength range of Ultraviolet (UV), visible, or Infrared (IR), we offer options that are ideal for use in various applications.
Features:
- Material from DUV to IR
- Custom dimension and shapes
- Standard and custom coating options available
- High laser damage threshold
Specifications：
Material BK7 or UV fused silica Focal Length Tolerance ±1% @589nm Design Wavelength 589nm Centration ≤3′ Diameter Tolerance +0/-0.1mm Clear Aperture ≥ central 90% of diameter Center Thickness Tolerance ±0.1mm Surface Quality 20/10（UVFS）/ 40/20（BK7） Surface Accuracy ≤ 1.5λ power，λ/2 irregularity（UVFS）
≤ 1.5λ power，λ/4 irregularity（BK7）
Chamfers 0-0.8mm face width×45°±15° 
Order Information：
BK7 Meniscus Lenses：
Part Number Dia(mm) Tc(mm) Te(mm) R1(mm)
R2(mm) EFL(mm)
Material LNS-254-R950-R459-BK7 25.4 2.86 3.8 95.0 -45.9 -175.0 BK7 LNS-254-R1000-R431-BK7 25.4 3.73 4.77 100 -43.11 -150.0 BK7 LNS-254-R900-R373-BK7 25.4 2.02 3.3 100 -38.973 -125.0 BK7 LNS-254-R900-R326-BK7 25.4 2.32 3.92 100 -33.8 -100 BK7 Note：
Other sizes and focal length are available upon request. Also the lens ring mounts are available upon request.
Key words:- Negative Meniscus Lenses OPTICAL broadband AR coating
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